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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.

The unsteady flow of a viscous incompressible fluid due to non-coaxial rotations of a porous disk and a fluid at infinity subjected to a periodic suction through a porous medium has been studied. The velocity field, shear stresses are obtained in closed form. The variations of primary and secondary velocities for different values of non dimensional parameters are depicted in figures.

The flow of a viscous incompressible fluid through a vertical channel in the presence of radiation immersed in a porous medium has been studied. Approximate solutions have been obtained for the velocity and temperature fields, shear stresses and rate of heat transfer using the perturbation technique. It is found that the primary velocity decreases with an increase in the radiation parameter as well as the Prandtl number for cooling of the plate. It is also found that with an increase in the permeability parameter, the primary velocity increases for cooling of the plate. The magnitude of the secondary velocity decreases near the plate y = 0 and increases near the plate y = d with an increase in the permeability parameter. The temperature distribution decreases with an increase of the radiation parameter as wall as the Prandtl number for cooling of the plate. The shear stresses and the rate of heat transfer, which are of physical interest, are presented in the form of tables.

The laminar flow of an incompressible Jeffrey fluid past an infinite wall is modelled and analyzed analytically. The suction velocity distribution consisting of a basic steady distribution with a superimposed weak transversely varying distribution is assumed. The problem turns out to be three-dimensional because of variation of suction velocity in transverse direction on the wall. A series expansion technique is employed to obtain approximate solutions for velocity field, skin friction, and pressure. The effects of various non-dimensional parameters emerging in model on main flow velocity component and wall shear stress in main flow direction and perpendicular to it are presented graphically. Strongly dependence of components of wall shear stress on elastic parameter is noted. Moreover, it is noted that Jeffrey fluid parameters are controlling parameters of drag force. [ABSTRACT FROM AUTHOR]

In this study, the magnetohydrodynamics (MHD) boundary layer flow with heat and mass transfer over a vertical infinite plate in a rotating system with periodic suction has been investigated. The system is placed in porous medium and the plate is subjected to heat source or sink. The model problem is solved numerically by the Crank-Nicolson scheme. The numerical results are presented graphically and the conclusion indicates that the flow field and other quantities of physical interest are significantly influenced by flow parameters. [ABSTRACT FROM AUTHOR]

This paper theoretically analyzes the effect of periodic suction on three dimensional flow of a viscous incompressible fluid past an infinite vertical porous plate embedded in a porous medium. The governing equations for the velocity and temperature of the flow field are solved employing perturbation technique and the effects of the pertinent parameters such as suction parameter α, permeability parameter Kp, Reynolds number Re etc. on the velocity, temperature, skin friction and the rate of heat transfer are discussed with the help of figures and tables. [ABSTRACT FROM AUTHOR]

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