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Wyświetlanie 1-38 z 38
Tytuł:
Zasady klimatyzacji wyrobisk górniczych kopalń węgla kamiennego w skrajnie trudnych warunkach geotermicznych
Ventilation of excavations in hard coal mines in critical geothermic conditions
Autorzy:
Knechtel, J.
Powiązania:
https://bibliotekanauki.pl/articles/166070.pdf
Data publikacji:
2015
Wydawca:
Stowarzyszenie Inżynierów i Techników Górnictwa
Tematy:
cieplne warunki pracy
klimatyzacja
przepływ ciepła i masy
thermal work conditions
ventilation
flow of heat and mass
Opis:
Zaproponowano metodykę zapewniającą zgodne z przepisami parametry powietrza kopalnianego w wyrobiskach o dużej koncentracji wydobycia, w których panują skrajnie trudne warunki geotermiczne. Przedstawiono zintegrowany system prognozowania, zwalczania i monitorowania zagrożenia klimatycznego dla sieci wyrobisk w głębokiej kopalni węgla kamiennego. Rozważania przeprowadzono w odniesieniu do poziomów, na których temperatura pierwotna skał jest nie tylko wyższa od 40° C, ale również poziomów, na których temperatura ta dochodzi do 50° C. Wymieniony system składa się z kilku modułów, a mianowicie: komputerowej bazy danych dotyczącej badanego obiektu (kopalni, poziomu, partii), zintegrowanej metody prognozowania warunków klimatycznych dla sieci wentylacyjnej w wyrobiskach z opływowymi prądami powietrza oraz w drążonych wyrobiskach z wentylacją odrębną, schematu temperaturowego rozpatrywanej sieci wentylacyjnej. Metodyka obejmuje sposoby efektywnej i ekonomicznej klimatyzacji głębokiego poziomu wydobywczego, przy wykorzystaniu schematu temperaturowego kopalnianej sieci wentylacyjnej, oraz rozwiązania klimatyzacyjne dla wyrobisk z wentylacją odrębną drążonych w skałach o temperaturze pierwotnej dużo wyższej od 40° C, kontrolę skuteczności podjętych środków prewencji zagrożenia klimatycznego oraz wprowadzenie ewentualnej korekty. Przy takim podejściu do problemu możliwe jest zapewnienie prawidłowych warunków klimatycznych w wyrobiskach górniczych o temperaturze pierwotnej skał zbliżonej do 50° C.
This paper presents a methodology which determines the parameters of mining air in highly productive excavations with critical geothermic conditions. An integrated system of forecasting, combating and controlling the climate hazard for excavation network in a deep hard coal mine was presented. The considerations included levels at which the original temperature is higher than 40° C and those whose original temperature comes up to 50° C. The mentioned system consists of the following modules: an electronic database for the tested object (mine, level, lot); an integrated method of forecasting climate conditions for ventilation network which includes excavations with streamlined air currents and excavations with separate ventilation; a temperature scheme of the considered ventilation network; a methodology including an effective and economic ventilation system of the deep output levels by the use of the temperature scheme of the ventilation network; ventilation solutions for excavations with separate ventilation driven in rocks with the original temperature significantly higher than 40° C; the inspection of efficiency of the taken measures for protection from the climate hazard as well as the application of potential corrections. Such an approach may ensure proper climate conditions in mining excavations with the original temperature of rocks approaching 50° C.
Źródło:
Przegląd Górniczy; 2015, 71, 1; 14-24
0033-216X
Pojawia się w:
Przegląd Górniczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Second Law Analysis of Flow, Heat and Mass Transfer Past a Nonlinearly Stretching Permeable Wedge with Temperature Jump and Chemical Reaction
Analiza produkcji entropii oraz transportu ciepła i masy w przepływie wzdłuż przepuszczalnego klina z uwzględnieniem skoku temperatury i reakcji chemicznych
Autorzy:
Dalir, M.
Powiązania:
https://bibliotekanauki.pl/articles/139528.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
wedge flow
temperature jump
chemical reaction
entropy analysis
przepływ wzdłuż klina
skok temperatury
reakcja chemiczna
analiza entropii
Opis:
Second law analysis (entropy generation) for the steady two-dimensional laminar forced convection flow, heat and mass transfer of an incompressible viscous fluid past a nonlinearly stretching porous (permeable) wedge is numerically studied. The effects of viscous dissipation, temperature jump, and first-order chemical reaction on the flow over the wedge are also considered. The governing boundary layer equations for mass, momentum, energy and concentration are transformed using suitable similarity transformations to three nonlinear ordinary differential equations (ODEs). Then, the ODEs are solved by using a Keller’s box algorithm. The effects of various controlling parameters such as wedge angle parameter, velocity ratio parameter, suction/injection parameter, Prandtl number, Eckert number, temperature jump parameter, Schmidt number, and reaction rate parameter on dimensionless velocity, temperature, concentration, entropy generation number, and Bejan number are shown in graphs and analyzed. The results reveal that the entropy generation number increases with the increase of wedge angle parameter, while it decreases with the increase of velocity ratio parameter. Also, in order to validate the obtained numerical results of the present work, comparisons are made with the available results in the literature as special cases, and the results are found to be in a very good agreement.
W pracy przedstawiono analizę numeryczną procesu produkcji entropi oraz transportu ciepła i masy w stacjonarnym, dwuwymiarowym przepływie konwekcyjnym cieczy lekkiej wzdłuż porowatego klina o nieliniowo zmiennym kącie rozwarcia. W analizie rozważono efekty związane z dyssypacją lepkościową, skokiem temperatury reakcjami chemicznymi pierwszego rzędu. Równania różniczkowe opisujące transport masy, pędu, energii i stężeń reagentów w warstwie przyściennej zostały przekształcone za pomoc˛a odpowiednich transformacji do układu trzech równań różniczkowych zwyczajnych. Trzymany układ został rozwiązany numerycznie za pomocą algorytmu typu box zaproponowanego przez Kellera. W pracy zbadano i przedstawiono w formie graficznej wpływ parametrów takich, jak kąt rozwarcia klina, intensywność transpiracji przez ścianę klina, liczby Prandtla, Eckerta i Schmidta, wielkość skoku temperatury i szybkość reakcji chemicznych na pola prędkości, temperatury i stężenia reagentów, produkcję entropii i liczbę Bejana. Otrzymane wyniki pokazują, że współczynnik produkcji entropii rośnie wraz z powiększaniem kąta klina i maleje wraz powiększaniem stosunku prędkości. W celu walidacji otrzymanych rezultatów, porównano je z wynikami innych dostępnych w literaturze badań i stwierdzono bardzo dobrą zgodność.
Źródło:
Archive of Mechanical Engineering; 2016, LXIII, 4; 565-587
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Numerical solution for the problem of heat and mass flow in the soil heated with warm air
Autorzy:
Bożek, B.
Kurpaska, S.
Powiązania:
https://bibliotekanauki.pl/articles/241006.pdf
Data publikacji:
2000
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
numerical solution
heat flow
mass flow
soils
warm air
differential equations
greenhouse substrate
system of heating pipes
explicite-implicite difference scheme
Opis:
In this paper a difference method of solving the system of differential equations is presented for differential equations, describing the distribution of temperature and water content in the greenhouse substrate heated with a system of heating pipes. The algorithm of solving the proposed method (explicite-implicite difference scheme) is presented. In addition, the effects of temperature and water content changes obtained from the solution of proposed the model as well as the model where the thermal diffusion of mass was included were compared.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2000, 47, 1-4; 75-96
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of convective heat and mass conditions in MHD flow of nanofluid
Autorzy:
Shehzad, S. A.
Hayat, T.
Alsaedi, A.
Powiązania:
https://bibliotekanauki.pl/articles/201220.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
nanofluid
MHD flow
convective mass condition
nonlinear analysis
HAM
przepływ MHD
analiza nieliniowa
Opis:
This article aims to investigate the two-dimensional magnetohydrodynamic (MHD) boundary layer flow of nanofluid. Convective mass condition is introduced. Analysis has been discussed in the presence of an applied magnetic field. The Brownian motion and thermophoresis effects are incorporated. The arising nonlinear problems are first converted to ordinary differential equations and then series solutions are constructed. Convergence of series solutions is examined through plots and numerical values. Results are plotted and discussed for the temperature and concentration. Numerical computations for skin-friction coefficient, local Nusselt and Sherwood numbers are performed and analyzed. Comparison with the previous limiting case is noted in an excellent agreement.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 2; 465-474
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of a chemically reactive MHD flow with heat and mass transfer over a permeable surface
Autorzy:
Fenuga, O. J.
Aroloye, S. J.
Popoola, A. O.
Powiązania:
https://bibliotekanauki.pl/articles/266282.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
transfer ciepła
transfer masy
przepływ magnetohydrodynamiczny
powierzchnia przepuszczalna
heat and mass transfer
chemically reactive MHD flow
permeable surface
Opis:
This paper investigates a chemically reactive Magnetohydrodynamics fluid flow with heat and mass transfer over a permeable surface taking into consideration the buoyancy force, injection/suction, heat source/sink and thermal radiation. The governing momentum, energy and concentration balance equations are transformed into a set of ordinary differential equations by method of similarity transformation and solved numerically by Runge- Kutta method based on Shooting technique. The influence of various pertinent parameters on the velocity, temperature, concentration fields are discussed graphically. Comparison of this work with previously published works on special cases of the problem was carried out and the results are in excellent agreement. Results also show that the thermo physical parameters in the momentum boundary layer equations increase the skin friction coefficient but decrease the momentum boundary layer. Fluid suction/injection and Prandtl number increase the rate of heat transfer. The order of chemical reaction is quite significant and there is a faster rate of mass transfer when the reaction rate and Schmidt number are increased.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 1; 53-66
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Experimental and numerical investigation of thermal flow meter
Autorzy:
Cebula, A.
Powiązania:
https://bibliotekanauki.pl/articles/240345.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
mass flowmeter
heat transfer
uniform heat flux
thermal model
miernik przepływu
wymiana ciepła
model termiczny
Opis:
The paper presents analytical and numerical model calculation results of the temperature distribution along the thermal flow meter. Results show a very good conformity between numerical and analytical model. Apart from the calculation results the experimental investigations are presented. The author performed the test where a temperature of duct wall surface was measured. Therelation between mass flow rate in terms of the duct surface temperature difference was developed.
Źródło:
Archives of Thermodynamics; 2015, 36, 3; 149-160
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of non-uniform heat generation /absorption and radiation on hydromagnetic dissipative flow over a porous nonlinear stretching surface with heat and mass fluxes
Autorzy:
Anjali Devi, S. P.
Agneeshwari, M.
Powiązania:
https://bibliotekanauki.pl/articles/264962.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
strumień ciepła
strumień masy
absorpcja ciepła
MHD
heat flux
mass flux
non-uniform heat generation/absorption
Opis:
Forced convective heat and mass transfer flow of hydromagnetic, radiating and dissipative fluid over a porous nonlinear stretching sheet in the presence of non-uniform heat generation/absorption is investigated numerically. The system of nonlinear partial differential equations governing the physical problem is reduced to nonlinear ordinary differential equations by means of suitable similarity transformations and are solved numerically using Nachtsheim Swigert shooting iteration scheme together with fourth order Runge Kutta method. The effects of various physical parameters on velocity, temperature and concentration distributions are depicted graphically. The important findings of this study exhibited that the effect of non-uniform heat generation/absorption parameter and radiation parameter have significant role in controlling thermal boundary layer thickness and temperature. Numerical values of the skin friction coefficient, temperature and concentration at the wall are shown in a tabula form. A comparison is made with previously published data which results in good agreement.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 36-52
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Closed form solutions of heat and mass transfer in the flow of a MHD visco-elastic fluid over a porous stretching sheet
Autorzy:
Ashokkunar, K.
Veena, P. H.
Pravin, V. K.
Powiązania:
https://bibliotekanauki.pl/articles/955325.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przenoszenie ciepła
przenoszenie masy
magnetohydrodynamika
rozciąganie
płyn lepkoplastyczny
heat and mass transfer
MHD flow
porous stretching sheet
visco-elastic fluid
Opis:
The problem of heat and mass transfer in a visco-elastic fluid flow over a stretching sheet in the presence of a uniform magnetic field is examined. The important physical quantities such as the skin friction coefficient, heat transfer co-efficient and the mass transfer co-efficient are determined. It is found that the heat and mass transfer distribution decreases with the increasing values of the visco-elastic parameter k1.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 4; 989-1002
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat and mass transfer mechanism on three-dimensional flow of inclined magneto Carreau nanofluid with chemical reaction
Autorzy:
Rao, B. Madhusudhana
Gopal, Degavath
Kishan, Naikoti
Ahmed, Saad
Prasad, Putta Durga
Powiązania:
https://bibliotekanauki.pl/articles/240005.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
carreau nanofluid
chemical reaction
MHD
heat and mass transfer
Opis:
The characteristic of nano sized particles mass flux conditions are engaged in this investigation. Here we assume that the nano sized particle flux is zero and the nano sized particle fraction arranged itself on the boundary layer. With this convincing and revised relation, the features of Buongiorno relation on three-dimensional flow of Carreau fluid can be applied in a more efficient way. The governing partial differential equations of continuity, momentum, energy and concentration equations which are transmitted into set of pair of nonlinear ordinary differential equations utilizing similar transformations. The numeric solutions are acquired by engaging the bvp4c scheme, which is a finite-difference code for solving boundary value problems. A parametric study is accomplished to demonstrate the impact of Prandtl number, Weissenberg numbers, radiation parameter, chemical reaction parameter, thermophoresis parameter, Brownian motion parameter and Lewis number on the fluid velocity, temperature and concentration profiles as well skin friction coefficient, Nusselt number and Sherwood number within the boundary layer. From this we find the way in which magnetic parameter contributes to the increase in local skin fraction, and the decrease in the Nusselt and Sherwood numbers in these cases. The effects of the velocity temperature and concentration profile are obtained and presented graphically.
Źródło:
Archives of Thermodynamics; 2020, 41, 2; 223-238
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of magnetohydrodynamic (MHD) nanofluid flow with heat and mass transfer over a porous stretching sheet
Autorzy:
Odesola, A. S.
Abiala, I. O.
Akinpelu, F. O.
Fenuga, O. J.
Powiązania:
https://bibliotekanauki.pl/articles/1839771.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
metoda elementów skończonych
wymiana ciepła
wymiana masy
magnetohydrodynamika
finite element method
heat and mass transfer
MHD
nanofluid flow
porous stretching sheet
Opis:
This work investigates a three-dimensional Magnetohydrodynamic (MHD) nanofluid flow with heat and mass transfer over a porous stretching sheet. Firstly, partial differential equations are transformed into coupled non-linear ordinary differential equations through a similarity variables transformation and solved by Galerkin Finite Element Methods (FEM). The effects of thermal radiation, viscous dissipation and chemical reaction on the fluid flow are considered. The behaviour and properties of pertinent flow parameters on the velocity, temperature and concentration profiles are presented and discussed graphically. The effects of the friction coefficient parameter, Nusselt and Sherhood numbers are also shown and considered using tables. The work is in good agreement in comparison with the recent work in literature.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 162-174
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of chemical reaction on MHD flow past an impulsively started infinite vertical plate with uniform heat and mass flux
Autorzy:
Chandrakala, P.
Powiązania:
https://bibliotekanauki.pl/articles/265578.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
reakcja chemiczna
płyta pionowa
strumień ciepła
strumień masy
MHD
chemical reaction
vertical plate
heat and mass flux
Opis:
Finite difference solutions of the unsteady MHD flow past an impulsively started infinite vertical plate with uniform heat and mass flux are presented here, taking into account the homogeneous chemical reaction of first order. The dimensionless governing equations are solved by an efficient, more accurate, unconditionally stable and fast converging implicit scheme. The effects of velocity, temperature and concentration for different parameters such as chemical reaction parameter, Schmidt number, Prandtl number, thermal Grashof number, mass Grashof number and time are studied. It is observed that due to the presence of a first order chemical reaction, the velocity increases during the generative reaction and decreases in the destructive reaction. It is observed that the velocity decreases in the presence of the magnetic field, as compared to its absence.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 2; 329-339
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modeling of heat and mass transfer in cylindrical ducts
Autorzy:
Duda, P.
Mazurkiewicz, G.
Powiązania:
https://bibliotekanauki.pl/articles/240939.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
obliczenia numeryczne
przepływ burzliwy
przepływ laminarny
wymiana ciepła
Graetz problem
heat transfer
laminar and turbulent flow
numerical solution
Opis:
In this work, numerical modeling of steady state heat and mass transfer is presented. Both laminar and hydrodynamically fully developed turbulent flow in a pipe are shown. Numerical results are compared with values obtained from analytical solution of such problems. The problems under consideration are often denoted as extended Graetz problems. They occur in heat exchangers using liquid metals as working fluid, in cooling systems for electric components or in chemical process lines. Calculations were carried out gradually decreasing the mesh size in order to examine the convergence of numerical method to analytical solution.
Źródło:
Archives of Thermodynamics; 2010, 31, 1; 33-43
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of chemical reaction and radiation on double diffusive flow of a viscous, dissipative fluid through porous medium in a rectangular cavity with heat sources
Autorzy:
Raju, T. L.
Muralidhar, P.
Powiązania:
https://bibliotekanauki.pl/articles/955281.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wymiana ciepła
wymiana masy
promieniowanie
rozproszenie
źródło ciepła
heat and mass transfer flow
radiation
dissipation
heat sources
rectangular cavity
porous medium
Opis:
In this paper, an attempt is made to discuss the combined influence of radiation and dissipation on the convective heat and mass transfer flow of a viscous fluid through a porous medium in a rectangular cavity using the Darcy model. Making use of the incompressibility, the governing non-linear coupled equations for the momentum, energy and diffusion are derived in terms of the non-dimensional stream function, temperature and concentration. The Galerkin finite element analysis with linear triangular elements is used to obtain the global stiffness matrices for the values of stream function, temperature and concentration. These coupled matrices are solved using an iterative procedure and expressions for the stream function, temperature and concentration are obtained as linear combinations of the shape functions. The behavior of temperature, concentration, the Nusselt number and Sherwood number is discussed computationally for different values of the governing parameters, such as the Rayleigh Number (Ra), heat source parameter (α), Eckert number (Ec), Schmidt Number (Sc), Soret parameter (S0), buoyancy ratio (N).
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 4; 1115-1150
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of heat and mass flux on MHD free convection flow through a porous medium with radiation and first order chemical reaction
Autorzy:
Awasthi, B.
Powiązania:
https://bibliotekanauki.pl/articles/265701.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
reakcja chemiczna
materiały porowate
magnetohydrodynamika
promieniowanie
ciepło
first order chemical reaction
porous medium
viscous dissipation
MHD
radiation
heat and mass fluxes
Opis:
The study of a magneto hydrodynamic (MHD) free convection flow of an incompressible viscous fluid flow past a vertical surface is analyzed by taking into account viscous dissipation under the influence of radiation effect and chemical reaction with constant heat and mass fluxes. The governing partial differential equations have been converted into a set of ordinary differential equations using non dimensional quantities. The perturbation technique has been applied to solve the system of partial differential equations. The velocity, temperature and concentration fields have been studied for the effect of the permeability parameter (α), Grashof number for heat transfer (Gr), Grashof number for mass transfer (Gm), Prandtl number (Pr), magnetic parameter (M), chemical reaction parameter (Kr), Schmidt number (Sc), Eckert number (E), radiation parameter (F) etc. The expressions for the skin-friction, rate of heat transfer and rate of mass transfer are also derived. It is observed that when the radiation parameter increases, the velocity increases near the vertical surface. It is also seen that the concentration decreases with an increase in the chemical reaction parameter (Kr).
Źródło:
International Journal of Applied Mechanics and Engineering; 2018, 23, 4; 855-871
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of chemical reaction on the heat and mass transfer of nanofluid flow over a nonlinear stretching sheet: a numerical study
Autorzy:
Misra, Santoshi
Govardhan, K.
Powiązania:
https://bibliotekanauki.pl/articles/266172.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
nanofluid
termoforeza
reakcja chemiczna
wymiana ciepła
wymiana masy
Brownian motion
thermophoresis
chemical reaction
heat transfer
mass transfer
Opis:
A numerical study on a steady, laminar, boundary layer flow of a nanofluid with the influence of chemical reaction resulting in the heat and mass transfer variation is made. The non-linear governing equations with related boundary conditions are solved using Adam’s predictor corrector method with the effect of a Brownian motion and thermophoresis being incorporated as a model for the nanofluid, using similarity transformations. Validation of the current numerical results has been made in comparison to the existing results in the absence of chemical reaction on MHD flows. The numerical solutions obtained for the velocity, temperature and concentration profiles for the choice of various parameters are represented graphically. Variations of heat and mass transfer across a Brownian motion and thermophoresis are studied and analyzed.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 2; 103-121
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat and mass transfer in a vertical channel flow through a porous medium in the presence of radiation
Autorzy:
Guria, M.
Powiązania:
https://bibliotekanauki.pl/articles/2174211.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
transport masy
promieniowanie
przepuszczalność
mass transfer
permeability
porous medium
periodic suction
radiation
Opis:
An analysis is made of heat and mass transfer in a three dimensional flow between two vertical porous plates through a porous medium. Analytical solutions have been obtained using the perturbation technique. The effect of non-dimensional parameters on velocity, temperature and concentration field are shown graphically. It is seen that the main flow velocity decreases with an increase in both the radiation parameter and Schmidt number but increases with an increase in the thermal Grashoff number, mass Grashoff number as well as the permeability parameter. Variations of the shear stress at the left plate are given in a tabular form. It is seen that the shear stress due to the primary flow at the left plate increases with an increase in the Reynolds number but decrease with an increase in the Schmidt number. With the increase of both the radiation parameter and Reynolds number the temperature decreases. The concentration field also decreases with an increase of the Schmidt number. Variations of mass flux at the left plate are given in tabular form. It is seen that the mass flux at the left plate increases with increase in both Schmidt number or Reynolds number.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 3; 63--78
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Flow and Thermal Phenomena In Evacuated Tube Collectors
Autorzy:
Demianiuk, A.
Sorko, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/386625.pdf
Data publikacji:
2012
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
kolektor słoneczny
przepływ ciepła
przepływ cieczy
flat plate solar collector
heat transfer
fluid flow in pipes
optimum mass flow rate
boundary equation method
Opis:
The subject of this case study is an issue of optimisation of flat tube solar collectors. Basic elements of energy analysis of performance parameters described by Hottel-Whillier equation are presented in the article. It is considered to be crucial to precisely analyse fluid flow through flow elements in evacuated tube collectors. It is especially important in the case of systems with channels of cross sections shapes different from circular and for the use of detailed mathematical description of complex film conduction phenomena. It is presented that the advanced analysis of the flow and thermal phenomena in complex heat transfer systems, represented by evacuated tube collectors, enables engineering rationalisation of technical solutions for these devices.
Źródło:
Acta Mechanica et Automatica; 2012, 6, 4; 5-10
1898-4088
2300-5319
Pojawia się w:
Acta Mechanica et Automatica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Soret and Dufour effects on MHD free convective flow past a vertical porous plate in the presence of heat generation
Autorzy:
Reddy, G. V. R.
Powiązania:
https://bibliotekanauki.pl/articles/264624.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
promieniowanie
wymiana ciepła
wymiana masy
tarcie
radiation
heat and mass transfer
skin-friction
Nusselt number
Sherwood number
Opis:
An MHD fluid flow is examined over a vertical plate in the presence of Dufour and Soret effects. The resulting momentum, energy and concentration equations are then made similar by introducing the usual similarity transformations. These similar equations are then solved numerically using the Runge-Kutta fourth order method with shooting technique. The effects of various parameters on the dimensionless velocity, temperature and concentration profiles as well as the local values of the skin-friction coefficient, the Nusselt number and Sherwood number are displayed graphically and in a tabular form. A comparison with previously published work is obtained and an excellent agreement is found.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 3; 649-665
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelowanie procesów transportu masy i ciepła w płaskich kolektorach słonecznych
Modeling of heat and mass transport phenomena in flat plate solar collectors
Autorzy:
Demianiuk, A. B.
Sorko, S. A.
Powiązania:
https://bibliotekanauki.pl/articles/403985.pdf
Data publikacji:
2014
Wydawca:
Polskie Towarzystwo Symulacji Komputerowej
Tematy:
płaski kolektor słoneczny
optymalny przepływ masowy
transport ciepła
przepływ cieczy w rurach
metoda brzegowych równań
flat plate solar collector
optimum mass flow rate
heat transfer
fluid flow in pipes
boundary equation method
Opis:
Przedmiotem opracowania jest zagadnienie technicznej optymalizacji płaskich rurowych kolektorów słonecznych. Przedstawiono podstawowe elementy energetycznej analizy parametrów użytkowych kolektorów słonecznych opisane równaniem Hottela-Whilliera. Zwrócono uwagę na konieczność szczegółowej analizy przepływu cieczy przez elementy przepływowe kolektorów rurowych, w szczególności w układach, w których przewody mają kształt przekroju poprzecznego różny od przekroju kołowego i na potrzebę dokładnego matematycznego opisu złożonych zjawisk przejmowania ciepła. Pokazano, że zaawansowana analiza zjawisk przepływowych i cieplnych w złożonych układach wymiany ciepła w przepływie, jakimi są rurowe, cieczowe kolektory słoneczne, umożliwia techniczną racjonalizację rozwiązań technicznych tych urządzeń.
The subject of this case study is an issue of optimisation of flat tube solar collectors. Basic elements of energy analysis of performance parameters described by Hottel-Whillier equation are presented in the article. It is considered to be crucial to precisely analyse fluid flow through flow elements in evacuated tube collectors. It is especially important in the case of systems with channels of cross-sections shapes different from circular and for the use of detailed mathematical description of complex film conduction phenomena. It is presented that the advanced analysis of the flow and thermal phenomena in complex heat transfer systems, represented by evacuated tube collectors, enables engineering rationalisation of technical solutions for these devices.
Źródło:
Symulacja w Badaniach i Rozwoju; 2014, 5, 1; 5-17
2081-6154
Pojawia się w:
Symulacja w Badaniach i Rozwoju
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Transient heat and mass transfer of hydromagnetic effects on the flow past a porous medium with movable vertical permeablesheet
Autorzy:
Okedoye, A. M.
Salawu, S. O.
Powiązania:
https://bibliotekanauki.pl/articles/1839708.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
porowatość
ssanie
metoda zaburzeń
przepływ MHD
movable plate
porosity
suction
perturbation method
MHD flow
Opis:
An unsteady flow of heat and species transport through a porous medium in an infinite movable vertical permeable flat surface is considered. The hydromagnetic chemical reactive fluid flow is stimulated by the thermal and solutant convection, and propelled by the movement of the surface. The formulated nonlinear flow equations in time space are solved analytically by asymptotic expansions to obtain solutions for the flow momentum, energy and chemical concentration for various thermo-physical parameters. The existence of flow characteristic is defined with the assistance of the flow parameters. In the study, the impact of some pertinent flow terms is reported and discussed. The study revealed that the species boundary layer increases with a generative chemical reaction and decreases with a destructive chemical reaction. Also, arise in the generative species reaction term reduces the flow momentum for the cooling surface. The impact of other flow governing parameters is displayed graphically as well as the fluid wall friction, wall energy and species gradients. The results of this study are important in chemical thermal engineering for monitoring processes to avoid solution blow up.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 4; 175-190
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of chemical reaction on mixed convective nanofluid flow on a vertical plate with uniform heat and mass fluxes
Autorzy:
Mondal, H.
Goqo, S. P.
Sibanda, P.
De, P.
Powiązania:
https://bibliotekanauki.pl/articles/265652.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ konwekcyjny
nanopłyny
reakcja chemiczna
free convective flow
nanofluids
chemical reaction
Opis:
The purpose of this paper is to consider a two dimensional free convective flow of a nanofluid due to the combined effects of thermal and mass diffusion in the presence of a chemical reaction of first order. The objective of the present investigation is to analyze the free convective flow in the presence of prescribed wall heat flux and mass flux condition. The governing equations of the linear momentum, energy equation and concentration are obtained in a dimensionless form by introducing a suitable group of similarity transformations. The transformed coupled non-linear ordinary differential equations are solved numerically by using appropriate boundary conditions for the various values of physical parameters. Computations are performed for a wide range of values of the various governing flow parameters of the velocity, temperature and species concentration profiles and results are presented graphically. Numerical results for the skin friction coefficient and local Nusselt number are also presented and analyzed in detail. The obtained results are compared with previously published work and are found to be in excellent agreement. The results are a very useful source of information for researchers on the subject of a free convective flow of a nanofluid. This paper illustrates chemical reaction effects on free convective flow of a nanofluid from a vertical plate with uniform heat and mass fluxes.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 2; 329-342
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Research methods in the study of heat transfer coefficient during flow in minichannels
Autorzy:
Tychanicz-Kwiecień, Maria
Grosicki, Sebastian
Powiązania:
https://bibliotekanauki.pl/articles/1819147.pdf
Data publikacji:
2021
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
heat transfer coefficient
minichannels
heat and mass transfer analogy
limiting current technique
thermal balance method
współczynnik przenikania ciepła
minikanały
analogia wymiany ciepła i masy
prąd graniczny
bilans cieplny
Opis:
The paper presents the specification of research methods commonly encountered in the studies of heat transfer processes in minichannels. In particular the following methods have been emphasized: electrochemical limiting current method as well as the thermal balance method. In thermal balance method the mean heat transfer coefficient is determined by the set of experimental thermal measurements of the investigated heat exchanger. In turn, limiting current method is based on heat and mass transfer analogy. The discussed research methods have been implemented on two specially designed and constructed test facilities with compact minichannel heat exchangers, which have been presented and described in details. In order to validate the designed setup, the preliminary experimental measurements of two minichannel heat exchangers with hydraulic diameter of 2 mm and rectangular cross sections during single-phase liquid flows have been carried out. In further perspective it is planned to extend the experimental studies of minichannel heat exchangers and to compare the results obtained by both methods described.
Źródło:
Journal of Mechanical and Energy Engineering; 2021, 5, 1; 59--68
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of radiation and Eckert number on MHD flow with heat transfer rate near a stagnation point over a non-linear vertical stretching sheet
Autorzy:
Fenuga, O. J.
Hassan, A. R.
Olanrewaju, P. O.
Powiązania:
https://bibliotekanauki.pl/articles/264652.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ magnetohydrodynamiczny
transfer ciepła
transfer masy
liczba Eckerta
MHD flow
heat and mass transfer
radiation
Eckert number stagnation–point
non-linear vertical stretching sheet
Opis:
This work investigates the effects of radiation and Eckert number on an MHD flow with heat transfer rate near a stagnation-point region over a nonlinear vertical stretching sheet. Using a similarity transformation, the governing equations are transformed into a system of ordinary differential equations which are solved numerically using the sixth order Runge-Kutta method with shooting technique. Tabular and graphical results are provided to examine the physical nature of the problem. Heat transfer rate at the surface decreases with radiation, Eckert number and as radiation increases, the flow temperature also increases for velocity ratio parameters […].
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 1; 27-36
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical reaction and MHD flow for magnetic field effect on heat and mass transfer of fluid flow through a porous medium onto a moving vertical plate
Autorzy:
Goud, B. Shankar
Nandeppanavar, Mahantesh M.
Powiązania:
https://bibliotekanauki.pl/articles/2174194.pdf
Data publikacji:
2022
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
reakcja chemiczna
pole magnetyczne
promieniowanie cieplne
MHD
chemical reaction
Keller box method
magnetic field
thermal radiation
Opis:
This article discusses the effect of heat and mass transfer in a boundary layer flow in the presence of a magnetic field of an electrically conducting and viscous fluid as it passes through a porous medium containing a heat source and a chemical reaction. By employing similarity variables, the governing equations are changed into nonlinear ordinary differential equations(ODEs). To solve the obtained equations numerically the Keller box method is used. Numerical and graphical representations of the results of different parameter values governing the flow system are given. The non-dimensional distributions of velocity, heat, and concentration are depicted graphically, while the Nusselt number, Sherwood number, and skin friction are determined numerically.
Źródło:
International Journal of Applied Mechanics and Engineering; 2022, 27, 2; 226--244
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydromagnetic flow past an exponentially accelerated isothermal vertical plate with uniform mass diffusion in the presence of chemical reaction of first order
Autorzy:
Muthucumaraswamy, R.
Valliammal, V.
Powiązania:
https://bibliotekanauki.pl/articles/265196.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
płyta pionowa
wymiana ciepła
wymiana masy
reakcja chemiczna
pole magnetyczne
accelerated
isothermal
vertical plate
exponential
heat and mass transfer
chemical reaction
magnetic field
Opis:
An exact solution of an unsteady flow past an exponentially accelerated infinite isothermal vertical plate with uniform mass diffusion in the presence of a transverse magnetic field has been studied. The plate temperature is raised to Tw and the species concentration level near the plate is also made to rise Cʹw . The dimensionless governing equations are solved using the Laplace-transform technique. The velocity, temperature and concentration profiles are studied for different physical parameters such as the magnetic field parameter, chemical reaction parameter, thermal Grashof number, mass Grashof number, Schmidt number, time and a. It is observed that the velocity decreases with increasing the magnetic field parameter.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 1; 259-267
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Theoretical study of heat transfer effects on flow past a parabolic started vertical plate in the presence of chemical reaction of first order
Autorzy:
Muthucumaraswamy, R.
Velmurugan, S.
Powiązania:
https://bibliotekanauki.pl/articles/955128.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
reakcja chemiczna
płyta pionowa
wymiana masy
wymiana ciepła
transformata Laplace'a
parabolic
homogeneous
chemical reaction
first order
vertical plate
heat and mass transfer
Opis:
An exact solution of an unsteady flow past a parabolic starting motion of an infinite vertical plate with variable temperature and mass diffusion, in the presence of a homogeneous chemical reaction of first order has been studied. The plate temperature as well as concentration level near the plate are raised linearly with time t. The dimensionless governing equations are solved using the Laplace-transform technique. The effects of velocity profiles are studied for different physical parameters such as the chemical reaction parameter, thermal Grashof number, mass Grashof number, Schmidt number and time. It is observed that the velocity increases with increasing values of the thermal Grashof number or mass Grashof number. The trend is just reversed with respect to the chemical reaction parameter.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 2; 275-284
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat and mass transfer effects on MHD flow past an inclined porous plate in the presence of chemical reaction
Autorzy:
Sandhya, A.
Ramana Reddy, G. V.
Deekshitulu, V. S.R.G.
Powiązania:
https://bibliotekanauki.pl/articles/1839806.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
reakcja chemiczna
źródło ciepła
promieniowanie cieplne
chemical reaction
heat source
inclined plate
porous medium
thermal radiation
Opis:
The impact of heat and mass transfer effects on an MHD flow past an inclined porous plate in the presence of a chemical reaction is investigated in this study. An effort has been made to explain the Soret effect and the influence of an angle of inclination on the flow field, in the presence of the heat source, chemical reaction and thermal radiation. The momentum, energy and concentration equations are derived as coupled second order partial differential equations. The model is non-dimensionalized and shown to be controlled by a number of dimensionless parameters. The resulting dimensionless partial differential equations can be solved by using a closed analytical method. Numerical results for pertaining parameters, such as the Soret number (Sr), Grashof number (Gr) for heat and mass transfer, the Schmidt number (Sc), Prandtl number (Pr), chemical reaction parameter (Kr), permeability parameter (K), magnetic parameter (M), skin friction (τ), Nusselt number (Nu) and Sherwood number (Sh) on the velocity, temperature and concentration profiles are presented graphically and discussed qualitatively.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 86-102
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemical reaction effects on MHD flow past a linearly accelerated vertical plate with variable temperature and mass diffusion in the presence of thermal radiation
Autorzy:
Muthucumaraswamy, R.
Geetha, E.
Powiązania:
https://bibliotekanauki.pl/articles/264827.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
izotermiczność
promieniowanie
płyta pionowa
wymiana masy
wymiana ciepła
pole magnetyczne
reakcja chemiczna
accelerated
isothermal
radiation
vertical plate
heat and mass transfer
magnetic field
chemical reaction
Opis:
An exact solution of first order chemical reaction effects on a radiative flow past a linearly accelerated infinite isothermal vertical plate with variable mass diffusion, under the action of a transversely applied magnetic field has been presented. The plate temperature is raised linearly with time and the concentration level near the plate is also raised to C'w linearly with time. The dimensionless governing equations are tackled using the Laplace-transform technique. The velocity, temperature and concentration fields are studied for different physical parameters such as the magnetic field parameter, radiation parameter, chemical reaction parameter, thermal Grashof number, mass Grashof number, Schmidt number, Prandtl number and time. It is observed that velocity increases with decreasing magnetic field parameter or radiation parameter. But the trend is just reversed with respect to the chemical reaction parameter.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 727-737
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat and mass transfer flow of nanofluids in presence of chemical reaction with partial slip conditions
Autorzy:
Narender, G.
Govardhan, K.
Sreedhar-Sarma, G.
Powiązania:
https://bibliotekanauki.pl/articles/1839754.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
Brownian motion
stretching sheet
thermophoresis
similarity solution
partial slip
chemical reaction
ruchy Browna
rozciąganie arkusza
termoforeza
reakcja chemiczna
Opis:
A mathematical model is presented for analyzing the convective fluid over a stretching surface in the presence of nanoparticles. The analysis of heat and mass transfer of converted fluid with slip boundary condition is investigated. To convert the governing Partial Differential Equations (PDEs) into a system of nonlinear Ordinary Differential Equations (ODEs) we use similarity transformations. The shooting method is used to solve the system of ODEs numerically, and obtained numerical results are compared with the published results and found that both are in excellent agreement. The numerical values obtained for the velocity, temperature and concentration profiles are presented through graphs and tables. A discussion on the effects of various physical parameters and heat transfer characteristics is also included.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 3; 71-84
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of viscous dissipation and wall conduction on steady mixed convection Couette flow of heat generating / absorbing fluid
Autorzy:
Ajibade, A. O.
Umar, A. M.
Powiązania:
https://bibliotekanauki.pl/articles/264671.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
strumień masy
kanał pionowy
konwekcja mieszana
mixed convection
viscous dissipation
vertical channel
boundary thickness
mass constant flux
Opis:
This article theoretically investigated mixed convection flow of heat generating/absorbing fluid in the presence of viscous dissipation and wall conduction effects. The flow is considered to be steady in a vertical channel with some boundary thickness. One of the plates is heated while the other is kept at ambient temperature. The governing flow equations were solved analytically using Homotopy Perturbation Method (HPM). The influences of the governing parameters were captured in graphs, tables and a table was constructed for validation of the work. It is worthwhile to stress that, both the velocity and temperature profiles decrease near the heated plate with an increase in boundary thickness (d) while the reverse cases were observed toward the cold plate. The velocity profile increases near the heated plate with increase in mixed convection parameter (Gre) and decreases towards the cold plate. Rate of heat transfer has been observed to decrease with increase in boundary plate thickness (d) while the critical value of (Gre) increases with growing boundary plate thickness. The study therefore established the importance of boundary plate thickness in mixed convection investigation.
Źródło:
International Journal of Applied Mechanics and Engineering; 2019, 24, 4; 12-35
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of convective heat and mass conditions in magnetohydrodynamic boundary layer flow with joule heating and thermal radiation
Autorzy:
Sharma, R. P.
Tinker, Seema
Gireesha, B. J.
Nagaraja, B.
Powiązania:
https://bibliotekanauki.pl/articles/1839793.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
konwekcja
magnetohydrodynamika
reakcja chemiczna
promieniowanie cieplne
convection
MHD
Joule heating
chemical reaction
thermal radiation
Opis:
A free convection viscous MHD flow over a semi-infinite vertical sheet with convective heat and mass conditions has been considered. The effects of thermal radiation, chemical reaction and Joule heating on flow are also accounted. The governing nonlinear partial differential equations have been transformed into a set of highly non-linear coupled ordinary differential equations (ODEs) using appropriate similarity transformations. Numerical solutions of transformed equations are obtained by employing the 5th order Runge-Kutta Fehlberg technique followed by the shooting technique. The influences of different flow parameters on the momentum, energy and mass field are discussed and shown graphically. Results reveal that temperature and concentration profiles enhance due to increasing heat and mass Biot number parameters.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 103-116
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Axisymmetric mixed convective MHD flow over a slender cylinder in the presence of chemically reaction
Autorzy:
Prasad, K. V.
Vaidya, H.
Vajravelu, K.
Datti, P. S.
Umesh, V.
Powiązania:
https://bibliotekanauki.pl/articles/264807.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
pole magnetyczne
reakcja chemiczna
przepływ konwekcyjny
metoda Keller-box
Keller-box method
Grashof number
slender cylinder
convective flow
magnetic field
chemical reaction
heat and mass transfer
Opis:
The present analysis is focused on the study of the magnetic effect on coupled heat and mass transfer by mixed convection boundary layer flow over a slender cylinder in the presence of a chemical reaction. The buoyancy effect due to thermal diffusion and species diffusion is investigated. Employing suitable similarity transformations, the governing equations are transformed into a system of coupled non-linear ordinary differential equations and are solved numerically via the implicit, iterative, second order finite difference method. The numerical results obtained are compared with the available results in the literature for some special cases and the results are found to be in excellent agreement. The velocity, temperature, and the concentration profiles are presented graphically and analyzed for several sets of the pertinent parameters. The pooled effect of the thermal and mass Grashof number is to enhance the velocity and is quite the opposite for temperature and the concentration fields.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 121-141
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of chemical reaction on magneto-micropolar fluid flow from a radiative surface with variable permeability
Autorzy:
Sharma, B. K.
Singh, A. P.
Yadav, K.
Chaudhary, R. C.
Powiązania:
https://bibliotekanauki.pl/articles/264925.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
reakcja chemiczna
płyn mikropolarny
magnetohydrodynamika
wymiana ciepła
chemical reaction
micropolar fluid
microrotation
magnetohydrodynamics
heat and mass transfer
Opis:
This paper presents a study of a hydromagnetic free convection flow of an electrically conducting micropolar fluid past a vertical plate through a porous medium with a heat source, taking into account the homogeneous chemical reaction of first order. A uniform magnetic field has also been considered in the study which acts perpendicular to the porous surface of the above plate. The analysis has been done by assuming varying permeability of the medium and the Rosseland approximation has been used to describe the radiative heat flux in the energy equation. Numerical results are presented graphically in the form of velocity, micro- rotation, concentration and temperature profiles, the skin-friction coefficient, the couple stress coefficient, the rate of heat and mass transfers at the wall for different material parameters. The study clearly demonstrates how a chemical reaction influences the above parameters under given conditions.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 833-851
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Magistrala 1-Wire jako rdzeń aparatury pomiarowej badań nad przepływem ciepła i masy w bioreaktorze
1-Wire bus as the core of the measuring apparatus studies of heat and mass flow in the bioreactor
Autorzy:
Promiński, P.
Mueller, W.
Pijanowski, D.
Powiązania:
https://bibliotekanauki.pl/articles/291390.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
1-Wire
aparatura pomiarowa
kompostowanie
measuring apparatus
composting
Opis:
Kompostowanie jest wysoce złożonym procesem, na który wpływ ma szereg czynników, dlatego badanie jego przebiegu wymaga stworzenia wysoce specjalistycznych stanowisk pomiarowych. Jedną z istotnych wielkości, jakie w sposób znaczący wpływają na przebieg procesu kompostowania jest temperatura, która charakteryzuje się zarówno zmiennością czasową i przestrzenną. Wyposażenie bioreaktorów w dużą liczbę czujników pomiarów temperatury komplikuje do tego stopnia proces pozyskiwania danych, iż koniecznością staje się jego automatyzacja. Autorzy przeanalizowali dostępne rozwiązania i podjęli decyzję o wykorzystaniu magistrali 1-Wire, jako szkieletu aparatury pomiarowej, umożliwiającej podjęcie szerszych i dokładniejszych badań dotyczących problematyki przepływu ciepła i masy oraz weryfikacji stopnia dojrzałości kompostu na podstawie ilości wytworzonego ciepła.
Composting is a highly complex process, which is affected by numerous factors, therefore, study on its course requires highly specialized measuring apparatus. One of the factors which significantly affects the composting process is temperature, which is characterized by both temporal and spatial variability. Equipment of bioreactors with a large number of temperature measurement sensors complicates the process of data acquisition to such extend that its automation is necessary. The authors analysed available solutions and decided to use 1- Wire bus as a frame of the measuring apparatus that allows to undertake research on problems of heat and mass flow and to verify the degree of maturity of compost based on the amount of heat produced.
Źródło:
Inżynieria Rolnicza; 2012, R. 16, nr 2, t. 2, 2, t. 2; 251-258
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Heat and mass transfer analogy for the laminar flow : discussion of the problem
Analogia transportu ciepła i masy : dyskusja problemu
Autorzy:
Iwaniszyn, M.
Jaroszyński, M.
Ochońska, J.
Łojewska, J.
Kołodziej, A.
Powiązania:
https://bibliotekanauki.pl/articles/306165.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Instytut Inżynierii Chemicznej PAN
Tematy:
analogia Chiltona-Colburna
analogia Léveque'a
analogia transportu ciepła i masy
równanie Fouriera-Kirchhoffa
rozwiązania teoretyczne
Opis:
The study deals with the heat and mass transfer analogy developed for both laminar and turbulent flows. The Chilton-Colburn and Léveque analogies are discussed. The Fourier-Kirchhoff equations covering the heat and mass transport as well as their theoretical solutions are also described. The ratio of Schmidt-to-Prandtl number for gases and liquids, obtained using the film and the penetration models, are discussed.
Praca poświęcona jest tematyce analogii transportu ciepła i masy dla przepływu laminarnego i turbulentnego. Omowiono analogie Chiltona-Colburna oraz Leveque'a. Opisano także rownania Fouriera-Kirchhoffa dla transportu ciepła i masy oraz ich teoretyczne rozwiązania. Przedstawiono stosunek liczby Schmidta do Prandtla dla gazow i cieczy uzyskany przy zastosowaniu modeli filmu i penetracji.
Źródło:
Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk; 2011, 15; 37-46
1509-0760
Pojawia się w:
Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of slip velocity in a magneto-micropolar fluid flow from a radiative surface with variable permeability: a numerical study
Autorzy:
Sharma, B. K.
Tailor, V.
Goyal, M.
Powiązania:
https://bibliotekanauki.pl/articles/265273.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
slip velocity
chemical reaction
micropolar fluid
MHD
heat and mass transfer
FDM
poślizg
reakcja chemiczna
płyn mikropolarny
magnetohydrodynamika
przenoszenie ciepła
Opis:
An analysis is presented to describe the hydromagnetic mixed convection flow of an electrically conducting micropolar fluid past a vertical plate through a porous medium with radiation and slip flow regime. A uniform magnetic field has been considered in the study which absorbs the micropolar fluid with a varying suction velocity and acts perpendicular to the porous surface of the above plate. The governing non-linear partial differential equations have been transformed into linear partial differential equations, which are solved numerically by applying the explicit finite difference method. The numerical results are presented graphically in the form of velocity, micro-rotation, concentration and temperature profiles, the skin-friction coefficient, the couple stress coefficient, the rate of heat and mass transfers at the wall for different material parameters.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 3; 637-651
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Bidirectionally stretched flow of Jeffrey liquid with nanoparticles, Rosseland radiation and variable thermal conductivity
Autorzy:
Archana, M.
Gireesha, B. J.
Rashidi, M. M.
Prasannakumara, B. C.
Gorla, R. S. R.
Powiązania:
https://bibliotekanauki.pl/articles/240409.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat mass transfer
jeffrey nanofluid
variable thermal conductivity
rosseland approximation
suction
ciepło
masa
zmienna przewodność cieplna
aproksymacja
ssanie
Opis:
Heat and mass transfer stretched flow of an incompressible, electrically conducting Jeffrey fluid has been studied numerically. Nanoparticles are suspended in the base fluid and it has many applications such as cooling of engines, thermal absorption systems, lubricants fuel cell, nanodrug delivery system and so on. Temperature dependent variable thermal conductivity with Rosseland approximation is taken into account and suction effect is employed in the boundary conditions. The governing partial differential equations are first transformed into set of ordinary differential equations using selected similarity transformations, which are then solved numerically using Runge-Kutta-Felhberg fourth-fifth order method along with shooting technique. The flow, heat and mass transfer characteristics with local Nusselt number for various physical parameters are presented graphically and a detailed discussion regarding the effect of flow parameters on velocity and temperature profiles are provided. It is found that, increase of variable thermal conductivity, radiation, Brownian motion and thermophoresis parameter increases the rate of heat transfer. Local Nusselt number has been computed for various parameters and it is observed that, in the presence of variable thermal conductivity and Rosseland approximation, heat transfer characteristics are higher as compared to the constant thermal conductivity and linear thermal radiation.
Źródło:
Archives of Thermodynamics; 2018, 39, 4; 33--57
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MHD and rotation effects on flow past an accelerated vertical plate with variable temperature and mass diffusion in the presence of chemical reaction
Autorzy:
Muthucumaraswamy, R.
Dhanasekar, N.
Eswara Prasad, G.
Powiązania:
https://bibliotekanauki.pl/articles/955271.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przyspieszenie
izoterma
płyta pionowa
wymiana ciepła
dyfuzja
pole magnetyczne
reakcja chemiczna
rotation
accelerated
isothermal
vertical plate
heat transfer
diffusion
magnetic field
chemical reaction
Opis:
An exact analysis of rotation effects on an unsteady flow of an incompressible and electrically conducting fluid past a uniformly accelerated infinite isothermal vertical plate, under the action of a transversely applied magnetic field is presented. The plate temperature is raised linearly with time and the concentration level near the plate is also raised to C’w. The dimensionless governing equations are solved using the Laplace-transform technique. The velocity profiles, temperature and concentration are studied for different physical parameters such as the magnetic field parameter, chemical reaction parameter, thermal Grashof number, mass Grashof number, Schmidt number, Prandtl number and time. It is observed that the velocity increases with increasing values of the thermal Grashof number or mass Grashof number. It is also observed that the velocity increases with decreasing values of the magnetic field parameter or rotation parameter Ω.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 4; 1087-1097
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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