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Combined mixed convection flow past a semi-infinite vertical porous plate with oscillating plate temperature

Vighnesam N. V., Soundalgekar V. M., Ray S. N.

Applied Mechanics and Engineering

2000

Vol. 5, no 3

673-683

Mixed convection flow past a semi-infinite vertical porous plate is studied here when the plate temperature is oscillating about a non-zero mean. Mean velocity, mean temperature, in-phase and out of phase components of unsteady part of the temperature are shown graphically. It is observed that an increase in suction velocity leads to an increase and an increase in injection velocity leads to a decrease in the amplitude of the rate of heat transfer. Also at large values of frequency, the oscillating component of temperature is superimposed on the mean temperature and is found to be unaffected by and suction-injection velocity.

Combined free and forced convection flow past a semi-infinite vertical plate embedded in a homogeneous porous medium

Ray S. N., Soundalgker V. M.

Applied Mechanics and Engineering

1999

Vol. 4, no 4

641-648

Combined free and forced convection flow of a viscous incompressible fluid past a semi-infinite vertical plate embedded in a homogeneous porous medium is studied here. With usual boundary layer transformations, the equations are reduced to local non-similar forms and these are solved numerically on a computer. Velocity and temperature profiles are shown graphically and the numerical values of the skin-friction and the rate of heat transfer are listed in a table. The effects of the parameters Gr/Re2 (Gr - Grashof number Re - the Reynolds number), 'alpha' (coefficient of viscosities of the fluid and porous medium), 'sigma' (the Darcy number), Pr (the Prandtl number) and E (the Eckert number) on the flow field are discussed.