A. Raptis

Radiation and free convection flow through a porous medium

Abstract Steady two dimensional free convection flow through a very porous medium bounded by a vertical infinite porous plate by the presence of radiation is condsidered. Expressions for the velocity and temperature are obtained. Effects of the radiation on the velocity field are discussed.

Effect of thermal radiation on MHD flow

An analysis of the steady MHD asymmetric flow of an electrically conducting fluid past a semi-infinite stationary plate is considered in the presence of radiation. Numerical solutions for the temperature field have been derived and the effect of the radiation parameter is discussed.

Free convection and mass transfer flow through a porous medium bounded by an infinite vertical limiting surface with constant suction

Abstract Steady two-dimensional free convection and mass transfer flow, of an incompressible viscous fluid through a porous medium bounded by a vertical infinite limiting surface (plane wall) is considered. Expressions for the velocity, temperature, concentration and the rate of heat transfer are obtained. Effects of Gr (Grashof number), Gm (modified Grashof number) and permeability K of the porous medium on the velocity and rate of heat transfer are discussed when the surface is subjected to a constant suction velocity.

MHD free convection flow past an accelerated vertical plate

The effect of a uniform transverse magnetic field on the free convection flow of an electrically conducting fluid past an infinite vertical plate for both the classes of impulsive as well as uniformly accelerated motion of the plate is discussed. In this analysis, the magnetic lines of force are assumed to be fixed relative to the plate. Laplace transform technique has been used to obtain the expressions for the velocity field and skin-friction for both cases. It is found that the effect of the magnetic field is to increase the velocity field in both cases.

Oscillatory flow through a porous medium by the presence of free convective flow

Abstract The purpose of this work is to study the effect of non-constant 2-dimensional free convective flow during the motion of a viscous incompressible fluid through a highly porous medium. The porous medium is bounded by a vertical plane surface of constant temperature. This surface absorbs the fluid with a constant velocity and the free stream velocity of the fluid vibrates about a mean constant value. Analytical expressions for the velocity of the fluid are given. The effects of Grashof number and the permeability parameter upon the velocity field are also shown in a graphic representation.

Radiation and viscoelastic flow

Abstract Steady flow of an elastico-viscous fluid by the presence of radiation is considered. Numerical solution for the temperature field is obtained. The temperature profiles are shown graphically for different values of the radiation parameter.

Viscoelastic Flow by the Presence of Radiation

An analysis of the steady flow of a viscoelastic fluid past an unmoving plate by the presence of radiation is considered. Analytical solutions for the temperature field have been derived and the effect of the radiation parameter on the temperature field is discussed.

Unsteady free convective flow through a porous medium

Abstract Unsteady 2-dimensional free-convective flow through a porous medium bounded by an infinite vertical plate is considered, when the temperature of the plate is oscillating with the time about a constant non-zero mean value. An analytical solution for the velocity field is derived and the effects of K (permeability parameter) and ω (parameter of frequency) on the velocity field are discussed.

Hydromagnetic free convection flow through a porous medium between two parallel plates

Abstract Steady hydromagnetic free convective flow of a conducting fluid through a porous medium bounded by two parallel plates is considered and effects of G (Grashof number) and the K (permeability parameter) on the velocity field are discussed.

Free convection flow through a porous medium bounded by a vertical surface

Steady two-dimensional free convection flow through a porous medium bounded by a vertical infinite surface is considered. Expressions for the velocity, temperature and the rate of heat transfer are obtained. Effects of G (Grashof number) and K (permeability parameter) on the velocity and the rate of heat transfer are discussed.