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Wyświetlanie 1-15 z 78
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:
Effect of slip condition on viscoelastic MHD oscillatory forced convection flow in a vertical channel with heat radiation
Autorzy:
Singh, K. D.
Powiązania:
https://bibliotekanauki.pl/articles/955264.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
konwekcja wymuszona
lepkosprężystość
porowatość
oscillatory
MHD
forced convection
viscoelastic
slip flow
porous medium
Opis:
In this paper an oscillatory flow of a viscoelastic, incompressible and electrically conducting fluid through a porous medium bounded by two infinite vertical parallel plates is discussed. One of these plates is subjected to a slip-flow condition and the other to a no-slip condition. The pressure gradient in the channel oscillates with time. A magnetic field of uniform strength is applied in the direction perpendicular to the plates. The induced magnetic field is neglected due to the assumption of a small magnetic Reynolds number. The temperature difference of the two plates is also assumed high enough to induce heat transfer due to radiation. A closed form analytical solution to the problem is obtained. The analytical results are evaluated numerically and then presented graphically to discuss in detail the effects of different parameters entering into the problem. A number of particular cases have been shown by dotted curves in the figures. During the analysis it is found that the physical and the mathematical formulations of the problems by Makinde and Mhone (2005), Mehmood and Ali (2007), Kumar et al. (2010) and Choudhury and Das (2012) are not correct. The correct solutions to all these important oscillatory flow problems are deduced.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 4; 1237-1248
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:
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:
Exact solution of MHD mixed convection periodic flow in a rotating vertical channel with heat radiation
Autorzy:
Singh, K. D.
Powiązania:
https://bibliotekanauki.pl/articles/265295.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
konwekcja mieszana
magnetohydrodynamika
promieniowanie cieplne
periodic flow
mixed convection
magnetohydrodynamic (MHD)
rotating system
heat radiation
Opis:
Magnetohydrodynamic (MHD) mixed convection flow of a viscous, incompressible and electrically conducting fluid in a vertical channel is analyzed analytically. A magnetic field of uniform strength is applied perpendicular to the planes of the channel walls. The fluid is acted upon by a periodic variation of the pressure gradient in the vertically upward direction. The temperature of one of the plates is non-uniform and the temperature difference of the walls of the channel is high enough to induce heat transfer due to radiation. The fluid and the channel rotate in unison with an angular velocity about the axis normal to the plates of the channel. An exact analytical solution of the problem is obtained. Two cases of small and large rotation have been considered to assess the effects of different parameters involved in the flow problem. The velocity field, the amplitude and the phase angle of the shear stress are shown graphically and discussed in detail. During analysis it is found that the flow problem studied by Makinde and Mhone (2005) is incorrect physically and mathematically.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 853-869
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsteady hydromagnetic Couette flow due to ramped motion of one of the porous plates
Autorzy:
Jha, B. K.
Jibril, H. M.
Powiązania:
https://bibliotekanauki.pl/articles/955270.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
przepływ Couette'a
pole magnetyczne poprzeczne
magnetohydrodynamika
Couette flow
transverse magnetic field
suction/injection
MHD
ramp motion
Hartmann number
porous plates
Opis:
An unsteady flow formation in Couette motion of an electrically conducting fluid subject to transverse magnetic field has been analyzed in the presence of suction/injection through the porous plates when one of the porous plates is in ramped motion. It is assumed that the porous plates are uniformly permeable and the fluid is entering the flow region through one of the porous plates at same rate as it is leaving through the other porous plate. The resulting boundary value problem has been solved exactly under the assumption of a negligible induced magnetic field, external electric field and pressure gradient. Unified closed form expressions for the velocity field and skin-friction corresponding to the case of a magnetic field fixed relative to the fluid or to the moving porous plate have been presented. In order to highlight the impact of the ramp motion of the porous plate on the fluid flow, it has also been compared with Couette flow between porous plates when one of the porous plates has been set into an impulsive motion.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 4; 1039-1056
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Unsteady two-layered fluid flow and heat transfer of conducting fluids in a channel between parallel porous plates under transverse magnetic field
Autorzy:
Linga Raju, T.
Nagavalli, M.
Powiązania:
https://bibliotekanauki.pl/articles/264466.pdf
Data publikacji:
2013
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
mieszanie płynów
przepływ niestacjonarny
ruch oscylacyjny
przenikanie ciepła
magnetohydrodynamics
two-layered fluid flow/immiscible fluids
unsteady flow
oscillatory motion
heat transfer
porous plate
Opis:
The unsteady magnetohydrodynamic flow of two immiscible fluids in a horizontal channel bounded by two parallel porous isothermal plates in the presence of an applied magnetic and electric field is investigated. The flow is driven by a constant uniform pressure gradient in the channel bounded by two parallel insulating plates, one being stationary and the other oscillating, when both fluids are considered as electrically conducting. Also, both fluids are assumed to be incompressible with variable properties, viz. different viscosities, thermal and electrical conductivities. The transport properties of the two fluids are taken to be constant and the bounding plates are maintained at constant and equal temperatures. The governing equations are partial in nature, which are then reduced to the ordinary linear differential equations using two-term series. Closed form solutions for velocity and temperature distributions are obtained in both fluid regions of the channel. Profiles of these solutions are plotted to discuss the effect on the flow and heat transfer characteristics, and their dependence on the governing parameters involved, such as the Hartmann number, porous parameter, ratios of the viscosities, heights, electrical and thermal conductivities.
Źródło:
International Journal of Applied Mechanics and Engineering; 2013, 18, 3; 699-726
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An overview of Millionschikovs quasi-normality hypothesis applied to turbulence
Autorzy:
Mamaloukas, C.
Mazumdar, H. P.
Powiązania:
https://bibliotekanauki.pl/articles/955186.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
turbulencja izotropowa
fluktuacja prędkości
magnetohydrodynamika
Millionschikov's quasi-normality hypothesis
isotropic turbulence
zero-fourth cumulant approximation
homogeneous turbulence
Opis:
In this paper, we examine the zero-fourth cumulant approximation that was applied to fluctuating velocity components of homogeneous and isotropic turbulence by M.D. Millionschikov. Since the publication of the remarkable paper of Millionschikov, many authors have applied this hypothesis to solve the closure problem of turbulence. We discuss here various studies by the other authors on the developments of this hypothesis and their applications to the incompressible velocity temperature, hydrodynamic and magnetohydrodynamic fluctuating pressure fields and the general magnetohydrodynamic turbulence field. Lastly, we discuss broadly the computational difficulties that arise in turbulence problems and their possible refinements. We include also some enlightments of the process of future work that could be undertaken in this field of research.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 1; 123-132
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of a Mass Transfer Area during Metal Melting in a Vacuum Induction Furnace
Określenie powierzchni wymiany masy w procesie wytopu metali w indukcyjnym piecu próżniowym
Autorzy:
Golak, S.
Przylucki, R.
Barglik, J.
Powiązania:
https://bibliotekanauki.pl/articles/352144.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
magnetohydrodynamics
free surface
mass transfer
numerical modelling
magnetohydrodynamika
powierzchnia swobodna
transfer masy
modelowanie numeryczne
Opis:
In the paper, a simulation model that allows for determination of the actual surface area of inductively stirred liquid metal and the value of metal near-surface velocity during its melting is presented. Also, the effects of induction furnace working frequency on both parameters are demonstrated. The simulation was performed for copper and liquid steel that were melted in two different induction furnaces. The calculation results were also used for determination of coefficients of copper mass transfer in liquid steel and of antimony mass transfer in liquid copper during their stirring in the discussed furnace.
W pracy przedstawiono model symulacyjny pozwalający na wyznaczenie wartości rzeczywistej powierzchni ciekłego metalu mieszanego indukcyjnie jak i wartości prędkości przypowierzchniowej metalu w trakcie jego topienia Wykazano jednocześnie wpływ częstotliwości roboczej pieca indukcyjnego na obydwie wielkości. Symulacji dokonano dla miedzi i ciekłej stali topionych w dwóch różnych piecach indukcyjnych. Wyniki obliczeń posłużyły także do wyznaczenia wartości współczynników transportu masy miedzi w ciekłej stali i antymonu w ciekłej miedzi w przypadku ich mieszania w omawianym agregacie.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 1; 287-292
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effects of thermal diffusion and viscous dissipation on unsteady MHD free convection flow past a vertical porous plate under oscillatory suction velocity with heat sink
Autorzy:
Prabhakar Reddy, B.
Powiązania:
https://bibliotekanauki.pl/articles/955143.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
płyta pionowa
prędkość ssania
pole elektromagnetyczne
przepływ ciepła i masy
magnetohydrodynamika
MHD
vertical plate
oscillatory suction velocity
heat sink
Galerkin FEM
Opis:
The thermal diffusion and viscous dissipation effects on an unsteady MHD free convection heat and mass transfer flow of an incompressible, electrically conducting, fluid past an infinite vertical porous plate embedded in a porous medium of time dependent permeability under oscillatory suction velocity in the presence of a heat absorbing sink have been studied. It is considered that the influence of a uniform magnetic field acts normal to the flow and the permeability of the porous medium fluctuates with time. The dimensionless governing equations for this investigation have been solved numerically by using the efficient Galerkin finite element method. The numerical results obtained have been presented through graphs and tables for the thermal Grashof number (Gr > 0) corresponding to the cooling of the porous plate and (Gr < 0) corresponding to heating of the porous plate to observe the effects of various material parameters encountered in the problem under investigation. Numerical data for skin-friction, Nusselt and Sherwood numbers are tabulated and then discussed.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 2; 303-320
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of soret effect on mhd mixed convection flow of visco-elastic fluid past a vertical surface with hall effect
Autorzy:
Jha, A. K.
Choudhary, K.
Sharma, A.
Powiązania:
https://bibliotekanauki.pl/articles/955306.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
dyfuzja termiczna
magnetohydrodynamika
źródło ciepła
thermal diffusion
Hall parameter
MHD
elastic parameters
Schmidt number
heat source
Opis:
The present paper deals with the unsteady motion of an MHD free convection flow of an incompressible non- Newtonian viscoelastic fluid past an infinite vertical plate in the presence of a heat source and Soret effect. A parametric study illustrating the influence of various parameters on the temperature, velocity as well as on the skin-friction and rate of heat transfer is conducted. The results of the effect of the magnetic field, the parameter describing the non-Newtonian behavior, and the velocity of suction and injection on both the velocity and temperature distributions are examined and shown graphically.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 1; 79-95
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
MHD two-layered unsteady fluid flow and heat transfer through a horizontal channel between
Autorzy:
Linga Raju, T.
Nagavalli, M.
Powiązania:
https://bibliotekanauki.pl/articles/955179.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
przepływ niestacjonarny
transfer ciepła
magnetohydrodynamics
immiscible fluids
rotating fluid
unsteady flow
heat transfer
Opis:
An unsteady magnetohydrodynamic (MHD) two-layered fluids flow and heat transfer in a horizontal channel between two parallel plates in the presence of an applied magnetic and electric field is investigated, when the whole system is rotated about an axis perpendicular to the flow. The flow is driven by a constant uniform pressure gradient in the channel bounded by two parallel insulating plates, when both fluids are considered as electrically conducting, incompressible with variable properties, viz. different viscosities, thermal and electrical conductivities. The transport properties of the two fluids are taken to be constant and the bounding plates are maintained at constant and equal temperatures. The governing partial differential equations are then reduced to the ordinary linear differential equations using two-term series. Closed form solutions for primary and secondary velocity, also temperature distributions are obtained in both the fluid regions of the channel. Profiles of these solutions are plotted to discuss the effects of the flow and heat transfer characteristics, and their dependence on the governing parameters involved, such as the Hartmann number, rotation parameter, ratios of the viscosities, heights, electrical and thermal conductivities.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 1; 97-121
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The evolution of linearized perturbations in a magnetohydrodynamic boundary layer
Autorzy:
Vijayalakshmi, A. R.
Balagondar, P. M.
Powiązania:
https://bibliotekanauki.pl/articles/955146.pdf
Data publikacji:
2014
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
magnetohydrodynamika
transformacja Fouriera
warstwa graniczna
pole magnatyczne
magnetohydrodynamic boundary layer
initial-value problem approach
Alfv’n velocity
Fourire transform technique
Opis:
The evolution of linearized perturbations in a magnetohydrodynamic shear flow is studied using the initial value problem approach. Here the resulting equation in time posed by using the Fourier transform is solved for the Fourier amplitudes for modeled boundary layer for different initial disturbances. The shear flow prototype here is a piecewise linear approximation of a magnetohydrodynamic boundary layer. The initial disturbances that are considered are a point source of the field of transverse velocity and magnetic field. Solutions are obtained for small values of Alfve’n velocity. The velocity plots are drawn for different values of Alfve’n velocity.
Źródło:
International Journal of Applied Mechanics and Engineering; 2014, 19, 2; 397-406
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analytical solution to the MHD flow of micropolar fluid over a linear stretching sheet
Autorzy:
Siddheshwar, P. G.
Powiązania:
https://bibliotekanauki.pl/articles/265502.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
differential equation
stretching sheet
MHD
micropolar fluid
linear stretching sheet
równania różniczkowe
magnetohydrodynamika
blacha
Opis:
The flow due to a linear tretching sheet in a fluid with suspended particles, modeled as a micropolar fluid, is considered. All reported works on the problem use numerical methods of solution or a regular perturbation technique. An analytical solution is presented in the paper for the coupled non-linear differential equations with inhomogeneous boundary conditions.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 2; 397-406
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hall effects and rotation effects on MHD flow past an exponentially accelerated vertical plate with combined heat and mass transfer effects
Autorzy:
Thamizhsudar, M.
Pandurangan, J.
Mathucumaraswamy, R.
Powiązania:
https://bibliotekanauki.pl/articles/265402.pdf
Data publikacji:
2015
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
Hall effect
MHD flow
rotation
exponentially
accelerated plate
temperature
mass diffusion
magnetohydrodynamika
pole magnetyczne
prędkość osiowa
Opis:
A theoretical solution of flow past an exponentially accelerated vertical plate in the presence of Hall current and MHD relative to a rotating fluid with uniform temperature and mass diffusion is presented. The dimensionless equations are solved using the Laplace method. The axial and transverse velocity, temperature and concentration fields are studied for different parameters such as the Hall parameter (m), Hartmann number (M), Rotation parameter (Ω), Schmidt number, Prandtl number, thermal Grashof number (Gr) and mass Grashof number (Gc). It has been observed that the temperature of the plate decreases with increasing values of the Prandtl number and the concentration near the plate increases with decreasing values of Schmidt number. It is also observed that both axial and transverse velocities increase with decreasing values of the magnetic field parameter or rotation parameter, but the trend gets reversed with respect to the Hall parameter. The effects of parameters m, M, […], Gr and Gc on the axial and transverse velocity profiles are shown graphically.
Źródło:
International Journal of Applied Mechanics and Engineering; 2015, 20, 3; 605-616
1734-4492
2353-9003
Pojawia się w:
International Journal of Applied Mechanics and Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 78

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