PL
 |
EN
Preferencje help
Polish version English version Język
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 9

Liczba wyników na stronie
first rewind previous Strona / 1 next fast forward last
Wyniki wyszukiwania
help Sortuj według:

help Ogranicz wyniki do:
first rewind previous Strona / 1 next fast forward last
1
Content available MHD free convective heat and mass transfer flow from a vertical porous surface with variable thermal conductivity, variable mass diffusivity and thermal diffusion including viscous dissipation and chemical reaction
Phakirappa J., Priyanka S., Veena P. H., Pravin V. K.
International Journal of Applied Mechanics and Engineering
|
2022
|
Vol. 27, no. 3
127--136
EN
analysis is carried out to study chemically reactive, viscous dissipative effects of an incompressible and electrically conducting fluid with MHD free convection adjacent to a vertical surface with variable thermal conductivity (VTD) and variable mass diffusivity (VMD). An approximate numerical solution for the steady laminar boundary layer flow over a wall of the surface in the presence of species concentration and thermal mass diffusion has been studied. Using numerical techniques the governing boundary layer equations are solved to get the exact solution. Numerical calculations are carried out for different values of dimensionless parameters. The results are exhibited through various graphs and it is observed from the analysis of the results that the velocity field is appreciably influenced by the magnetic effect, porous effect, chemical reaction and buoyancy ratio between the species and thermal diffusion at the wall of the surface.
2
Content available Non-Newtonian momentum transfer past an isothermal stretching sheet with applied suction
Veena P. H., Suresh B., Pravin V. K., Goud A. M.
International Journal of Applied Mechanics and Engineering
|
2017
|
Vol. 22, no. 3
665--674
EN
The paper discusses the flow of an incompressible non-Newtonian fluid due to stretching of a plane elastic surface in a saturated porous medium in the approximation of boundary layer theory. An exact analytical solution of non-linear MHD momentum equation governing the self-similar flow is given. The skin friction co-efficient decreases with an increase in the visco-elastic parameter k1 and increase in the values of both the magnetic parameter and permeability parameter.
3
Content available Unsteady three-dimensional MHD flow due to impulsive motion with heat and mass transfer past a stretching sheet in a saturated porous medium
Rajagopal K., Veena P. H., Pravin V. K.
International Journal of Applied Mechanics and Engineering
|
2013
|
Vol. 18, no. 1
137--151
EN
The development of velocity, temperature and concentration fields of an incompressible viscous electrically conducting fluid, caused by impulsive stretching of the surface in two lateral directions and by suddenly increasing the surface temperature from that of the surrounding fluid in a saturated porous medium is studied. The partial differential equations governing the unsteady laminar boundary layer flow are solved analytically. For some particular cases, closed form solutions are obtained, and for large values of the independent variable asymptotic solutions are found. The surface shear stress in x and y directions and the surface heat transfer and surface mass transfer increase with the magnetic parameter and with permeability parameter and the stretching ratio, and there is a smooth transition from the short-time solution to the long-time solution.
4
Content available Closed form solutions of heat and mass transfer in the flow of a MHD visco-elastic fluid over a porous stretching sheet
Ashokkunar K., Veena P. H., Pravin V. K.
International Journal of Applied Mechanics and Engineering
|
2013
|
Vol. 18, no. 4
989--1002
EN
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.
5
Content available remote Free convective heat and mass transfer flow over a non-isothermal stretching sheet with added heat source and thermal diffusion in a saturated porous medium
Pravin V. K., Rajagopal K., Veena P. H., Umesh K. S.
International Journal of Applied Mechanics and Engineering
|
2011
|
Vol. 16, no 1
177-194
EN
The present paper deals with the study of MHD free convection and mass transfer flow of an incompressible viscous fluid past a continuously moving non-isothermal infinite vertical sheet in non-Darcy porous media in the presence of large suction under the influence of uniform magnetic field considering heat source and thermal diffusion with viscous dissipation, inertia term and stress work. Introducing the usual similarity transformations, the equations of momentum, energy and concentration are made linear. To obtain the solution of the problem, ordinary differential equations are solved analytically. The effects of various physical parameters such as the magnetic parameter, permeability parameter, inertia parameter, suction/blowing parameter on heat transfer characteristics are analysed. One of the important findings of our study is that of increasing the value of the inertia parameter k3 decreases the velocity profile and to increase the temperature profile.
6
Content available remote Heat and mass transfer in a non-linear MHD flow over a stretching surface with internal heat generation and chemical reaction in a porous medium
Veena P. H., Pravin V. K., Phakirappa J.
International Journal of Applied Mechanics and Engineering
|
2008
|
Vol. 13, no 2
499-514
EN
The boundary layer flow of an electrically conducting fluid with a magnetic field applied transversely to the direction of the flow in a saturated porous medium is studied. An analytical solution for the steady hydromagnetic free convection flow over a stretching surface with a power law velocity in the presence of species concentration, chemical reaction and internal heat generation has been obtained by solving the governing equations using similarity transformation technique. Numerical calculations are carried out for different values of the dimensionless parameters in the problem and results are justified through graphs. We found that results obtained for the flow field were influenced appreciatly by the chemical reaction term, magnetic field and porous media.
7
Content available remote Heat and mass transfer flow with variable thermal conductivity and variable mass diffusivity in an MHD visco-elastic fluid over a non-isothermal stretching sheet
Veena P. H., Pravin V. K., Shahjahan S. M.
International Journal of Applied Mechanics and Engineering
|
2008
|
Vol. 13, no 2
515-541
EN
In this paper we present a mathematical analysis of heat and mass transfer phenomena in a visco-elastic fluid flow over a non-isothermal stretching sheet with variable thermal conductivity and variable mass diffusivity. Similarity transformation are used to convert highly non-linear partial differential equations into ordinary differential equations. Several closed form analytical solutions for non-dimensional temperature, concentration, heat flux and mass flux are obtained in the form of confluent hypergeometric functions for two different types of the boundary conditions, namely: (i) wall with prescribed second-order power law temperature and second-order power law concentration (PST) and (ii)wall with prescribed second-order power law heat flux and second-order power law mass flux (PHF). The effect of various physical parameters such as the suction/blowing parameter , heat source/sink parameter [...], Prandtl number Pr, Schmidt number Sc, visco-elastic parameter and permeability parameter on the temperature and concentration profiles are analyzed.
8
Content available remote Diffusion of chemically reactive species of an electrically conducting visco-elastic fluid immersed in a porous medium over a stretching sheet with prescribed surface concentration and prescribed wall mass flux
Rajagopal K., Veena P. H., Pravin V. K.
International Journal of Applied Mechanics and Engineering
|
2008
|
Vol. 13, no 2
457-472
EN
In this paper, we present a mathematical analysis of mass transfer phenomena in a magneto hydrodynamic visco-elastic fluid immersed in a porous medium with prescribed surface concentration and prescribed wall mass flux. The influence of reaction rate on the transfer of chemically reactive species is studied. The flow is caused solely by the linearly stretching sheet and the reactive species is emitted from this sheet and undergoes an isothermal and homogeneous one stage reaction as it diffuses into the surrounding fluid. Several non-dimensional similarity transformations are introduced to reduce the concentration conservation equation to an ordinary differential equation in both the cases. (PST and PHF). An exact analytical solution due to Siddappa and Abel (ZAMP 36, 1985) is adopted for velocity, whereas the concentration equation is solved analytically for first order reactions in both the PST and PHF cases. The computations showed that the effect of destructive chemical reaction is to reduce the thickness of the concentration boundary layer and increase the mass transfer rate from the sheet to the surrounding fluid in the presence of a transverse magnetic field. This effect is more effective for zero and first order reactions than for thesecond and higher order. The effect of various physical parameters are analysed in the PST and PHF cases. The effects of all these parameters on wall concentration gradient are also discussed.
9
Content available remote Unsteady mass transfer and magnetohydrodynamic flow of visco-elastic fluid over a stretching sheet saturated in a porous medium with suction/blowing
Veena P. H., Pravin V. K., Nagbhooshan J. K.
International Journal of Applied Mechanics and Engineering
|
2007
|
Vol. 12, no 1
263-282
EN
An unsteady two-dimensional and mass transfer flow of a visco-elastic, incompressible and electrically conducting fluid saturated in a porous medium with suction or blowing is studied. The permeability of the porous medium fluctuates with time about a constant mean. The surface absorbs the fluid with constant velocity and the velocity oscillates depending on the stretching rate (b). Analytical solutions for the velocity, skin friction and concentration are obtained. The influence of various parameters entering into the problem are discussed. The velocity of the visco-elastic fluid is found to decrease in the presence of the magnetic field and porous media as compared to the study of viscous fluid. It is also found that the effect of unsteadiness in the wall velocity and skin friction are found to be appreciable.
first rewind previous Strona / 1 next fast forward last
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.