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Wyświetlanie 1-15 z 16
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:
Experimental and numerical investigations of natural convection phenomena in a fermentation tank
Autorzy:
Klembt, Daniel
Meironke, Heiko
Powiązania:
https://bibliotekanauki.pl/articles/95195.pdf
Data publikacji:
2019
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
ultrasonic doppler velocimetry
numerical simulation
natural convection flow
welocymetria dopplerowska
symulacja numeryczna
przepływ konwekcyjny
Opis:
In the context of investigations of real multiphase flows, the university has its own 350 litre fermentation tank with comprehensive acoustic flow and temperature measurement technology for the systematically investigation, of the influence of the fermentation activity, distribution of yeast and occurring convection phenomena. Due to the many problems with the optical (e.g. PIV) and acoustic (e.g. UDV) measurement in a real fermenting fluid the numerical simulation was already used in earlier publications. To validate the numerical models, extensive experimental investigations were carried out which show that the flow in the fermenter is caused only by the reaction products of the yeast and the cooling panels and controls the yeast distribution. In this paper, both the numerical (CFD) and the experimental investigations serve as a starting point to influence the yeast distribution. The described convection flow can only temporarily guarantee the uniform distribution of the yeast in the fermenter until the sedimentation of the yeast at the tank bottom (bottom-fermenting yeast) finally begins. The aim of the investigation is to influence the convection flow in certain zones by targeted cooling or heating of the jackets in such a way that a uniform spatial distribution of the yeast over the entire fermentation process is ensured and thus optimal conditions for its metabolic processes are given. Finally, the numerical simulation is validated with the experimental data.
Źródło:
Journal of Mechanical and Energy Engineering; 2019, 3, 3; 235-244
2544-0780
2544-1671
Pojawia się w:
Journal of Mechanical and Energy Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of induced magnetic field on transient natural convection flow in a vertical channel: The Riemann sum approximation approach
Autorzy:
Jha, B. K.
Sani, I.
Powiązania:
https://bibliotekanauki.pl/articles/266260.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
induced magnetic field
natural convection flow
Riemann-sum approximation
pole magnetyczne
przepływ konwekcyjny
twierdzenie Laplace'a
Opis:
This paper investigates the role of induced magnetic field on a transient natural convection flow of an electrically conducting, incompressible and viscous fluid in a vertical channel formed by two infinite vertical parallel plates. The transient flow formation inside the channel is due to sudden asymmetric heating of Chanel walls. The time dependent momentum, energy and magnetic induction equations are solved semi-analytically using the Laplace transform technique along with the Riemann-sum approximation method. The solutions obtained are validated by comparisons with the closed form solutions obtained for the steady states which hale been derived separately and also by the implicit finite difference method. Graphical results for the temperature, velocity, induced magnetic field, current density, and skin-friction based on the semi-analytical solutions are presented and discussed.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 1; 65-85
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Dual solutions for boundary layer flow of moving fluid over a moving surface with power-law surface temperature
Autorzy:
Mukhopadhyay, S.
Gorla, R. S. R.
Powiązania:
https://bibliotekanauki.pl/articles/265215.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ konwekcyjny
przepływ płynu
temperatura powierzchni
forced convective flow
moving fluid
flat surface
power-law surface temperature
dual solutions
Opis:
An analysis of heat transfer for boundary layer forced convective flow past a moving flat surface parallel to a moving stream is presented. The power-law surface temperature at the boundary is prescribed. The surface temperature varying directly (or inversely) with power-law exponent is considered. The similarity solutions for the problem are obtained and the reduced ordinary differential equations are solved numerically. To support the validity of the numerical results, a comparison is made with known results from the open literature for some particular cases of the present study. When the surface and the fluid move in the opposite directions, dual solutions exist.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 1; 113-124
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsteady MHD natural convective boundary layer flow and heat transfer over a truncated cone in the presence of pressure work
Autorzy:
Ajay, C. K.
Srinivasa, A. H.
Powiązania:
https://bibliotekanauki.pl/articles/122607.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
convection
pressure work
truncated cone
MHD
Prandtl number
przepływ konwekcyjny
konwekcja
stożek ścięty
liczba Prandtla
wymiana ciepła
Opis:
The aim of the present paper is to analyse the effect of MHD on unsteady natural convection boundary layer flow and heat transfer over a truncated cone in the presence of pressure work. Suitable transformation is utilized to form a system of coupled non-linear partial differential equations for governing both the flow and heat transfer. These equations have been solved numerically by utilizing an implicit finite difference scheme along with quasilinearization method. Here, the computed numerical results are displayed graphically in terms of the local Nusselt number, skin friction, temperature distribution, and velocity distribution for various values of the magnetic and pressure work parameters along with the fixed Prandtl number
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 1; 1-16
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsteady MHD natural convective boundary layer flow and heat transfer over a truncated cone in the presence of pressure work
Autorzy:
Ajay, C. K.
Srinivasa, A. H.
Powiązania:
https://bibliotekanauki.pl/articles/1839804.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
convection
pressure work
truncated cone
MHD
Prandtl number
przepływ konwekcyjny
konwekcja
stożek ścięty
liczba Prandtla
wymiana ciepła
Opis:
The aim of the present paper is to analyse the effect of MHD on unsteady natural convection boundary layer flow and heat transfer over a truncated cone in the presence of pressure work. Suitable transformation is utilized to form a system of coupled non-linear partial differential equations for governing both the flow and heat transfer. These equations have been solved numerically by utilizing an implicit finite difference scheme along with quasilinearization method. Here, the computed numerical results are displayed graphically in terms of the local Nusselt number, skin friction, temperature distribution, and velocity distribution for various values of the magnetic and pressure work parameters along with the fixed Prandtl number
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 1; 5-16
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mass transfer effects on an unsteady MHD free convective flow of an incompressible viscous dissipative fluid past an infinite vertical porous plate
Autorzy:
Reddy, B. P.
Powiązania:
https://bibliotekanauki.pl/articles/264683.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ konwekcyjny
magnetohydrodynamika
równanie różniczkowe
free convection flow
MHD
non-linear system
partial differential equation
Ritz FEM
Opis:
In this paper, a numerical solution of mass transfer effects on an unsteady free convection flow of an incompressible electrically conducting viscous dissipative fluid past an infinite vertical porous plate under the influence of a uniform magnetic field considered normal to the plate has been obtained. The non-dimensional governing equations for this investigation are solved numerically by using the Ritz finite element method. The effects of flow parameters on the velocity, temperature and concentration fields are presented through the graphs and numerical data for the skin-friction, Nusselt and Sherwood numbers are presented in tables and then discussed.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 143-155
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hydromagnetic rarefied fluid flow over a wedge in the presence of surface slip and thermal radiation
Autorzy:
Das, K.
Sharma, R. P.
Duari, P. R.
Powiązania:
https://bibliotekanauki.pl/articles/264410.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
convective flow
heat transfer
surface slip
magnetic field
thermal radiation
przepływ konwekcyjny
przenoszenie ciepła
pole magnetyczne
promieniowanie cieplne
Opis:
An analysis is presented to investigate the effects of thermal radiation on a convective slip flow of an electrically conducting slightly rarefied fluid, having temperature dependent fluid properties, over a wedge with a thermal jump at the surface of the boundary in the presence of a transverse magnetic field. The reduced equations are solved numerically using the finite difference code that implements the 3-stage Lobatto IIIa formula for the partitioned Runge-Kutta method. Numerical results for the dimensionless velocity and temperature as well as for the skin friction coefficient and the Nusselt number are presented through graphs and tables for pertinent parameters to show interesting aspects of the solution.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 4; 827-837
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Initial unsteady free convective flow past an infinite vertical plate with radiation and mass transfer effects
Autorzy:
Khan, A.
Solanki, R.
Powiązania:
https://bibliotekanauki.pl/articles/266197.pdf
Data publikacji:
2017
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
free convection flow
porous medium
heat transfer
mass transfer
MHD
przepływ konwekcyjny
porowatość
przenoszenie ciepła
przenoszenie masy
magnetohydrodynamika
Opis:
An exact solution and analysis of an initial unsteady two dimensional free convection flow, heat and mass transfer in the presence of thermal radiation along an infinite fixed vertical plate when the plate temperature is instantaneously raised, is presented. The fluid considered is a gray, absorbing emitting radiation but a nonscattering medium. Three cases have been discussed, in particular, namely, (i) when, the plate temperature is instantaneously raised to a higher constant value, (ii) when, the plate temperature varies linearly with time and (iii) when, the plate temperature varies non-linearly with time. A close form general solution for all the cases has been obtained in terms of repeated integrals of error functions. In two particular cases, the solutions in terms of the repeated integrals of error functions have been further simplified to forms containing only error functions. It is observed that for an increase in the radiation parameter N or a decrease in the Grashof number Gr or Gm, there is a fall in the velocity or temperature, but compared to the no radiation case or no diffusing species, there is a rise in the velocity and temperature of the fluid.
Źródło:
International Journal of Applied Mechanics and Engineering; 2017, 22, 4; 931-943
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of Hall current on unsteady hydromagnetic free convection flow past an impulsively moving vertical plate with Newtonian heating
Autorzy:
Seth, G. S.
Sarkar, S.
Sharma, R.
Powiązania:
https://bibliotekanauki.pl/articles/264598.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ konwekcyjny
transformacja Laplace'a
tarcie
hydromagnetic free convection flow
Newtonian heating
Hall current
porous medium
INVLAP routine in Matlab
Opis:
An investigation of unsteady hydromagnetic free convection flow of a viscous, incompressible and electrically conducting fluid past an impulsively moving vertical plate with Newtonian surface heating embedded in a porous medium taking into account the effects of Hall current is carried out. The governing partial differential equations are first subjected to the Laplace transformation and then inverted numerically using INVLAP routine of Matlab. The governing partial differential equations are also solved numerically by the Crank-Nicolson implicit finite difference scheme and a comparison has been provided between the two solutions. The numerical solutions for velocity and temperature are plotted graphically whereas the numerical results of skin friction and the Nusselt number are presented in tabular form for various parameters of interest. The present solution in special case is compared with a previously obtained solution and is found to be in excellent agreement.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 1; 187-203
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:
Numerical predictions of laminar flow and free convection heat transfer from an isothermal vertical flat plate
Autorzy:
Belhocine, Ali
Stojanovic, Nadica
Abdullah, Oday Ibraheem
Powiązania:
https://bibliotekanauki.pl/articles/27309866.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
free convective flow
vertical flat plate
similarity solution
boundary layer flow
dimensionless temperature
Prandtl number
Runge-Kutta method
swobodny przepływ konwekcyjny
rozwiązanie podobieństwa
przepływ warstwy granicznej
bezwymiarowa temperatura
numer Prandtla
Metoda Runge-Kutty
Opis:
In this present work, the laminar free convection boundary layer flow of a two-dimensional fluid over the vertical flat plate with a uniform surface temperature has been numerically investigated in detail by the similarity solution method. The velocity and temperature profiles were considered similar to all values and their variations are as a function of distance from the leading edge measured along with the plate. By taking into account this thermal boundary condition, the system of governing partial differential equations is reduced to a system of non-linear ordinary differential equations. The latter was solved numerically using the Runge-Kutta method of the fourth-order, the solution of which was obtained by using the FORTRAN code on a computer. The numerical analysis resulting from this simulation allows us to derive some prescribed values of various material parameters involved in the problem to which several important results were discussed in depth such as velocity, temperature, and rate of heat transfer. The definitive comparison between the two numerical models showed us an excellent agreement concerning the order of precision of the simulation. Finally, we compared our numerical results with a certain model already treated, which is in the specialized literature.
Źródło:
Archive of Mechanical Engineering; 2022, LXIX, 4; 749--773
0004-0738
Pojawia się w:
Archive of Mechanical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analogy between thermal and mass diffusion effects of a free convective flow in rectangular enclosure
Autorzy:
Ambethkar, Vusala
Powiązania:
https://bibliotekanauki.pl/articles/1839737.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
free convective flow
thermal diffusion effects
mass diffusion effects
rectangular enclosure
average Nusselt number
average Sherwood number
empirical correlations
swobodny przepływ konwekcyjny
efekty dyfuzji termicznej
efekty dyfuzji masowej
korelacje empiryczne
średnia liczba Sherwooda
średnia liczba Nusselta
Opis:
In this investigation, the analogy between thermal and mass diffusive effects of a free convective flow in a rectangular enclosure is emphasized. The upwind finite volume method is used to discretize the governing equations of the continuity, momentum, energy and mass transfer. The novelty in this exploration is to appropriately modify the well-known Semi-Implicit Method for Pressure-Linked Equations (SIMPLE) algorithm so that it suits to the present problem and thereby, the new flow variables such as the temperature and the concentration are computed. An empirical correlation for the average Sherwood number (Sh) that does not exist in literature is suggested in this work. The average Sherwood numbers for distinct fluids (gases and liquids) are calculated, and mass diffusion effects within the horizontal rectangle are analyzed. The average Nusselt numbers (Nu) are calculated for distinct fluids such as liquids (Pr ≫1), liquid metals (Pr≪1) and gases (Pr < 1) for different Rayleigh numbers in the range of 3x105 ≤ RaL ≤ 7x10 9 from relevant empirical correlations existing in the literature. Accordingly, the thermal diffusion effects within the horizontal rectangle are analyzed.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 4; 5-20
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analogy between thermal and mass diffusion effects of a free convective flow in rectangular enclosure
Autorzy:
Ambethkar, Vusala
Powiązania:
https://bibliotekanauki.pl/articles/1839750.pdf
Data publikacji:
2020
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
free convective flow
thermal diffusion effects
mass diffusion effects
rectangular enclosure
average Nusselt number
average Sherwood number
empirical correlations
swobodny przepływ konwekcyjny
efekty dyfuzji termicznej
efekty dyfuzji masowej
korelacje empiryczne
średnia liczba Sherwooda
średnia liczba Nusselta
Opis:
In this investigation, the analogy between thermal and mass diffusive effects of a free convective flow in a rectangular enclosure is emphasized. The upwind finite volume method is used to discretize the governing equations of the continuity, momentum, energy and mass transfer. The novelty in this exploration is to appropriately modify the well-known Semi-Implicit Method for Pressure-Linked Equations (SIMPLE) algorithm so that it suits to the present problem and thereby, the new flow variables such as the temperature and the concentration are computed. An empirical correlation for the average Sherwood number (Sh) that does not exist in literature is suggested in this work. The average Sherwood numbers for distinct fluids (gases and liquids) are calculated, and mass diffusion effects within the horizontal rectangle are analyzed. The average Nusselt numbers (Nu) are calculated for distinct fluids such as liquids (Pr ≫1), liquid metals (Pr≪1) and gases (Pr < 1) for different Rayleigh numbers in the range of 3x105 ≤ RaL ≤ 7x10 9 from relevant empirical correlations existing in the literature. Accordingly, the thermal diffusion effects within the horizontal rectangle are analyzed.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2020, 19, 4; 5-20
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical solutions of steady free convective flow in a rectangular region with discrete wall heat and concentration sources
Autorzy:
Ambethkar, Vusala
Basumatary, Lakshmi Rani
Powiązania:
https://bibliotekanauki.pl/articles/122750.pdf
Data publikacji:
2019
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
control volume
discretized
temperatures
concentration
free convective flow
heat and concentration sources
heat sources
concentration sources
horizontal and vertical directions
horizontal directions
vertical directions
kontrola głośności
konwekcja swobodna
swobodny przepływ konwekcyjny
metoda objętości skończonych
źródła ciepła
źródła koncentracji
Opis:
In this paper, numerical solutions are obtained for steady free convective flow in a rectangular region with discrete wall heat and concentration sources by using the finite volume method. The governing equations consist of the continuity, momentum, energy and mass transfer. These equations conjointly with suitable boundary conditions are solved numerically by using this method. The novel concept in this work is to generalize the SIMPLE algorithm suitably and thereby compute the numerical solutions of the flow variables such as the temperature (θ) and the concentration (C) in addition to the components of velocity and the pressure. All non-dimensional parameters are chosen suitably in accordance with the physical significance of the problem under investigation. With the help of these numerical solutions, we have depicted the profiles of the velocity, pressure, temperature and concentration along the horizontal and vertical directions of the geometric centre of the region. The validity of the numerical solutions are ensured by comparing the present solutions with the benchmark solutions. Code validation has been given for the present problem.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 4; 5-18
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 16

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