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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:
Distribution of heat exchange coefficient and vertical two-phase cross-flow structures examination over tube bundles, using DPIV and electrochemical methods
Badanie nierównomierności rozkładu współczynnika wnikania ciepła na powierzchni rur oraz niejednorodności struktur wokół rur, przy przepływie mieszaniny dwufazowej z wykorzystaniem metody elektrochemicznej i DPIV
Autorzy:
Karaś, M
Zając, D.
Ulbrich, R.
Powiązania:
https://bibliotekanauki.pl/articles/2073407.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wymiana ciepła
DPIV
elektrochemiczna
przepływ dwufazowy
heat exchange
electrochemical method
two-phase flow
Opis:
Przeprowadzono badania nad przepływem dwufazowym wznoszącym przez przestawny i równoległy pęk rur. Za pomocą cyfrowej anemometrii obrazowej DPIV dokonano wizualizacji przepływu. Do określenia nierównomierności wymiany ciepła na powierzchni rurek wykorzystano elektrochemiczną metodę opartą na analogii wymiany ciepła i masy. Wyniki otrzymane dwiema metodami zestawiono badając wpływ rozkładu pola prędkości wokół rur na intensywność wymiany ciepła na jej powierzchni.
Two-phase vertical flow over a tube bundle was examined. To calculate the heat transfer coefficient on tubes' surface, the electrochemical technique based on heat and mass transfer analogy was used. The Digital Particle Image Velocimetry (DPIV) technique was applied to create velocity fields around tubes. The results obtained using both methods were compared in order to get an overview of velocity distribution around the tube and its influence on heat transfer intensity on its surface.
Źródło:
Inżynieria i Aparatura Chemiczna; 2013, 5; 431--432
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new approach for study the electrohydrodynamic oscillatory flow through a porous medium in a heating compliant channel
Autorzy:
Haroun, M. H.
Powiązania:
https://bibliotekanauki.pl/articles/1839817.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ oscylacyjny
elektrohydrodynamika
wymiana ciepła
oscillatory flow
electrohydrodynamics
porous medium
heat transfer
compliant channel
Opis:
The governing equations of an electrohydrodynamic oscillatory flow were simplified, using appropriate nondimensional quantities and the conversion relationships between fixed and moving frame coordinates. The obtained system of equations is solved analytically by using the regular perturbation method with a small wave number. In this study, modified non-dimensional quantities were used that made fluid pressure in the resulting equations dependent on both axial and vertical coordinates. The current study is more realistic and general than the previous studies in which the fluid pressure is considered functional only in the axial coordinate. A new approach enabled the author to find an analytical form of fluid pressure while previous studies have not been able to find it but have found only the pressure gradient. Analytical expressions for the stream function, electrical potential function and temperature distribution are obtained. The results show that the electrical potential function decreases by the increase of the Prandtl number, secondary wave amplitude ratio and width of the channel.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 30-44
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An investigation into the influence of different parameters on the onset of boiling in minichannels
Autorzy:
Piasecka, M.
Powiązania:
https://bibliotekanauki.pl/articles/240757.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
inicjacja wrzenia
przepływ wrzenia
wymiana ciepła
flow boiling
heat transfer
Incipience (onset) of boiling
Opis:
The paper presents experimental studies on boiling heat transfer in rectangular minichannels. The investigations focus on the transition from single phase forced convection to nucleate boiling, i.e., in the zone of boiling incipience. The experiment has been carried out with FC-72, R-123 and R-11 at the Reynolds number below 4700, corresponding to mass flow rate range 95-710 kg/(m s). The main part of the test section is a minichannel of pre-set depth from 0.7 to 2 mm and width (20, 40 and 60 mm), with different spatial orientations from vertical to horizontal and 30% inclination angle adjustment. The objective of the paper includes the impact of selected parameters (liquid flow velocity, pressure and inlet liquid subcooling, channel dimensions and spatial orientation) on the boiling incipience in minichannels. The investigations are intended to develop a correlation for the calculations of the Nusselt number under the conditions of boiling incipience in the minichannel as a function of changeable parameters.
Źródło:
Archives of Thermodynamics; 2012, 33, 4; 67-90
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation on the effects of obstruction and side ratio on non-Newtonian fluid flow behavior around a rectangular barrier
Autorzy:
Noferesti, Sara
Ghassemi, Hassan
Nowruzi, Hashem
Powiązania:
https://bibliotekanauki.pl/articles/122461.pdf
Data publikacji:
2019
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
non-Newtonian fluids
heat transfer
finite volume method
laminar flow
płyn nieniutonowski
przenikanie ciepła
wymiana ciepła
metoda objętości skończonej
przepływ laminarny
Opis:
In this paper, the characteristics of the flow and forced heat transfer of power law non-Newtonian fluids that flow around a quadrilateral and rectangular cylinder that are located in a 2D channel are investigated by use of the finite volume method (FVM) in a steady state flow regime. To this accomplishment, in the constant temperature, the effects of a different obstruction ratio, aspect ratio and Reynolds number are investigated. The Reynolds number in the range 5 ≤ Re ≤ 40, the power index in the range 0.5 ≤ n ≤ 1.4, the aspect ratio in the range 0.5 ≤ a ≤ 2, and the obstruction ratio in the range 0.125 ≤ b ≤ 0.5 were selected. By surveying the drag coefficient profiles, it’s concluded that as the obstruction ratio increases, the drag coefficient is increased, while an increase in the Reynolds number causes the lower drag coefficient. In addition, the drag coefficient is strongly increased by aspect ratio enhancements.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2019, 18, 1; 53-67
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wymiana ciepła w przepływie dwóch cieczy niemieszających się
Heat transfer in the flow of two immiscible liquids
Autorzy:
Dybek, B.
Wardach, I.
Powiązania:
https://bibliotekanauki.pl/articles/2071921.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wymiana ciepła
przepływ ciecz-ciecz
ciecze nie mieszające się
heat transfer
liquid-liquid flow
immiscible liquids
Opis:
W pracy przedstawiono wyniki badań doświadczalnych przebiegu procesu reaktywnej ekstrakcji kwasu cytrynowego z roztworu wodnego z użyciem dwutlenku węgla w stanie nadkrytycznym. Zbadano wpływ parametrów procesowych (temperatury, szybkości mieszania, czasu realizacji) na przebieg i efektywność procesu. Wyniki badań doświadczalnych prowadzonych z zastosowaniem dwutlenku węgla w stanie nadkrytycznym porównano z wynikami otrzymanymi przy użyciu rozpuszczalników organicznych: 1 -oktanolu i n-heptanu.
In this paper the results of experiments of reactive extraction of citric acid from aqueous solution with the use of supercritical carbon dioxide are presented. The influence of process parameters (temperature, stirrer speed, time) on the process course and efficiency was investigated. The results of experiments obtained with the use of supercritical carbon dioxide were compared with those obtained using organic solvents: 1-octanol and n-heptan.
Źródło:
Inżynieria i Aparatura Chemiczna; 2012, 6; 312-313
0368-0827
Pojawia się w:
Inżynieria i Aparatura Chemiczna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical study of an air plane solar collector with the baffle in zigzag form
Autorzy:
Guendouz, N.
Bibi-Triki, N.
Didi, F.
Zidani, C.
Powiązania:
https://bibliotekanauki.pl/articles/240592.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
turbulent flow
forced convection
rectangular pipe
baffle
heat transfer
przepływ turbulentny
konwekcja wymuszona
przegroda
wymiana ciepła
Opis:
The production of thermal energy from solar energy by flat collectors finds nowadays many applications due to their innumerable economic and environmental interests. Currently, conservation of energy resources has become a global priority. On the other hand, given the dizzying demand for energy, has led specialists to find new techniques, such as renewable energies (solar, wind and geothermal). The present work is a contribution, by numerical simulation, to the study of heat transfer in flat solar collectors. On the basis of some experimental data, several simulation calculations have been carried out in order to determine the influencing parameters allowing better performance of the sensors and ensuring a good homogeneity of the temperature distributions. Based on the observation that, due to the low thermophysical properties of the air used as heat transfer fluid, solar air collectors rather give poor yields. It has been found very useful to have ‘baffling’ obstacles of various shapes and forms in the solar collector duct. This increases the thermal transfer of a coolant, which clearly improves the thermal efficiency of the solar air collector. This article consists mainly of studying the effects on heat transfer of turbulent forced convection by baffles of zigzag shapes, placed in a rectangular channel, using the finite volume method. The pressure-velocity coupling has been processed by the SIMPLEC algorithm. The results are presented in terms of the average Nusselt number and temperature field for different positions.
Źródło:
Archives of Thermodynamics; 2018, 39, 4; 141--156
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
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:
Numerical investigation on the transition of fluid flow characteristics through a rotating curved duct
Autorzy:
Hasan, Mohammad Sanjeed
Islam, MD. Sirajul
Badsha, MD. Faisal
Mondal, Rabindra Nath
Lorenzini, Giulio
Powiązania:
https://bibliotekanauki.pl/articles/1839803.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
wymiana ciepła
przepływ wtórny
liczba Taylora
rotating curved duct
Taylor number
flow transition
secondary flow
heat transfer
Opis:
Time-dependent flow investigation through rotating curved ducts is utilized immensely in rotating machinery and metal industry. In the ongoing exploration, time-dependent solutions with flow transition through a rotating curved square duct of curvature ratio 0.009 have been performed. Numerical calculations are carried out for constant pressure gradient force, the Dean number Dn = 1000 and the Grashof number Gr = 100 over a wide range of the Taylor number values […] for both positive and negative rotation of the duct. The software Code:Blocks has been employed as the second programming tool to obtain numerical solutions. First, time evolution calculations of the unsteady solutions have been performed for positive rotation. To clearly understand the characteristics of regular and irregular oscillations, phase spaces of the time evolution results have been enumerated. Then the calculations have been further attempted for negative rotation and it is found that the unsteady flow shows different flow instabilities if Tr is increased or decreased in the positive or in the negative direction. Two types of flow velocities such as axial flow and secondary flow and temperature profiles have been exposed, and it is found that there appear two- to four-vortex asymmetric solutions for the oscillating flows for both positive and negative rotation whereas only two-vortex for the steady-state solution for positive rotation but four-vortex for negative rotation. From the axial flow pattern, it is observed that two high-velocity regions have been created for the oscillating flows. As a consequence of the change of flow velocity with respect to time, the fluid flow is mixed up in a great deal which enhances heat transfer in the fluid.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 3; 45-63
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical solutions of heat transfer for laminar flow in rectangular channels
Autorzy:
Rybiński, W.
Mikielewicz, J.
Powiązania:
https://bibliotekanauki.pl/articles/240574.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
analytical solution
heat transfer
rectangular channel
laminar flow
fully developed
rozwiązanie analityczne
wymiana ciepła
kanał prostokątny
przepływ laminarny
Opis:
The paper presents two analytical solutions namely for Fanning friction factor and for Nusselt number of fully developed laminar fluid flow in straight mini channels with rectangular cross-section. This type of channels is common in mini- and microchannel heat exchangers. Analytical formulae, both for velocity and temperature profiles, were obtained in the explicit form of two terms. The first term is an asymptotic solution of laminar flow between parallel plates. The second one is a rapidly convergent series. This series becomes zero as the cross-section aspect ratio goes to infinity. This clear mathematical form is also inherited by the formulae for friction factor and Nusselt number. As the boundary conditions for velocity and temperature profiles no-slip and peripherally constant temperature with axially constant heat flux were assumed (H1 type). The velocity profile is assumed to be independent of the temperature profile. The assumption of constant temperature at the channel’s perimeter is related to the asymptotic case of channel’s wall thermal resistance: infinite in the axial direction and zero in the peripheral one. It represents typical conditions in a minichannel heat exchanger made of metal.
Źródło:
Archives of Thermodynamics; 2014, 35, 4; 29-42
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Large Eddy Simulation of turbulent flowand heat transfer in a Kenics static mixer
Autorzy:
Murasiewicz, Halina
Zakrzewska, Barbara
Powiązania:
https://bibliotekanauki.pl/articles/185383.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
heat transfer
turbulent flow
Large Eddy Simulation
CFD
static mixer
wymiana ciepła
przepływ turbulentny
Symulacja dużych wirów
mikser
Opis:
CFD modelling of momentum and heat transfer using the Large Eddy Simulation (LES) approach hasbeen presented for a Kenics static mixer. The simulations were performed with the commercial codeANSYS Fluent 15 for turbulent flow of three values of Reynoldsnumber,Re=5 000, 10 000 and18 000. The numerical modelling began in the RANS model, where standardk−εturbulence modeland wall functions were used. Then the LES iterations started from the initial velocity and temperaturefields obtained in RANS. In LES, the Smagorinsky–Lilly modelwas used for the sub-grid scalefluctuations along with wall functions for prediction of flowand heat transfer in the near-wall region.The performed numerical study in a Kenics static mixer resulted in highly fluctuating fields of bothvelocity and temperature. Simulation results were presented and analysed in the form of velocity andtemperature contours. In addition, the surface-averaged heat transfer coefficient values for the wholeinsert length were computed and compared with the literature experimental data. Good compliance ofthe LES simulation results with the experimental correlation was obtained.
Źródło:
Chemical and Process Engineering; 2019, 40, 1; 87--99
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancement of turbulent airflow and heat transfer through a rectangular microchannel with different types of baffles
Autorzy:
Saha, Sandip
Raut, Santanu
Das, Apurba Narayan
Powiązania:
https://bibliotekanauki.pl/articles/2141504.pdf
Data publikacji:
2021
Wydawca:
Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej
Tematy:
turbulent air flow
heat transfer
local Nusselt number
friction coefficient
turbulentny przepływ powietrza
wymiana ciepła
liczba Nusselta
współczynnik tarcia
Opis:
The objective of this work is to discuss the turbulent air hydro-thermal phenomena over a rectangular microchannel with different types of baffle (rectangular, triangular, and trapezoidal) mounted on both the walls of the microchannel. The finite volume method with the second order upwind scheme has been utilized to discretize the governing equations and to study the turbulent airflow characteristics; the SST k-ꞷ turbulence model has been adopted. For nine different cases, the different characteristics of fluid flow phenomena and thermal behaviour with the variations in the Reynolds number ranging from [5,000-25,000] and for three different values of inter baffle spacing have been studied in this manuscript. Due to the presence of baffle, it is revealed that the vortex arises on the upper wall and the thermal phenomena enhances with the decrease in inter baffle spacing.
Źródło:
Journal of Applied Mathematics and Computational Mechanics; 2021, 20, 3; 41-52
2299-9965
Pojawia się w:
Journal of Applied Mathematics and Computational Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mixed convection in MHD flow and heat transfer rate near a stagnation-point on a non-linear vertical stretching sheet
Autorzy:
Fenuga, O. J.
Hassan, A. R.
Olanrewaju, P. O.
Powiązania:
https://bibliotekanauki.pl/articles/265943.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
konwekcja mieszana
przepływ magnetohydrodynamiczny
wymiana ciepła
mixed convection
MHD flow
heat transfer rate
stagnation point
non-linear vertical stretching sheet
Opis:
This work investigates the mixed convection in a Magnetohydrodynamic (MHD) flow and 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 fourth order Runge-Kutta method with shooting technique. The influence of pertinent flow parameters on velocity, temperature, surface drag force and heat transfer rate are computed and analyzed. Graphical and tabular results are given to examine the nature of the problem. The heat transfer rate at the surface increases with the mixed convection.
Źródło:
International Journal of Applied Mechanics and Engineering; 2020, 25, 1; 37-51
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Convective heat transfer in a micropolar fluid over an unsteady stretching surface
Autorzy:
Prasad, K. V.
Vaidya, H.
Vajravelu, K.
Powiązania:
https://bibliotekanauki.pl/articles/266164.pdf
Data publikacji:
2016
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ niestacjonarny
wymiana ciepła
tarcie
metoda Keller-box
unsteady flow
microrotation
heat transfer
skin friction
Nusselt number
Keller-box method
Opis:
An unsteady boundary layer free convective flow and heat transfer of a viscous incompressible, microploar fluid over a vertical stretching sheet is investigated. The stretching velocity is assumed to vary linearly with the distance along the sheet. Two equal and opposite forces are impulsively applied along the x-axis so that the sheet is stretched, keeping the origin fixed in the micropolar fluid. The transformed highly non-linear boundary layer equations are solved numerically by an implicit finite difference scheme for the transient, state from the initial to the final steady-state. To validate the numerical method, comparisons are made with the available results in the literature for some special cases and the results are found to be in good agreement. The obtained numerical results are analyzed graphically for the velocity, the microrotation, and the temperature distribution; whereas the skin friction, the couple stress coefficient and the Nusselt number are tabulated for different values of the pertinent parameters. Results exhibit a drag reduction and an increase in the surface heat transfer rate in the micropolar fluid flow compared to the Newtonian fluid flow.
Źródło:
International Journal of Applied Mechanics and Engineering; 2016, 21, 2; 407-422
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł

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