Journal of Applied Fluid MechanicsJAFMMechanical Engineeringhttp://jafmonline.net1admin173535721735364510.29252/jafmenjalali1389410gregorian20107132online1fulltexten10.29252/jafm.03.02.11889Mixed Convection in a Composite System Bounded by Vertical WallsgeneralResearchA combined convection process between two parallel vertical infinite walls, containing an incompressible viscous
fluid layer and a fluid saturated porous layer has been presented analytically. There is a vertical axial variation of
temperature in the upward direction along the walls. The Brinkman extended Darcy model is applied to describe the
momentum transfer in the porous region. The viscosity of the fluid layer and the effective viscosity of the porous
layer are assumed to be different. Also the thermal conductivities of both fluid and porous layers are assumed to be
different. The graphs and tables have been used to distinguish the influence of distinct parameters on the velocity and
skin-friction. It is determined that the velocity is intensified on making greater the temperature difference between the
walls while increment in the viscosity ratio (porous/fluid) parameter diminishes the velocity of the fluid. It has been
observed that the numerical values of the skin-frictions have an increasing tendency with the increment in the values
of temperature difference between the walls while decreasing tendency with the increment in the viscosity ratio
parameter (porous/fluid).Mixed convection, composite system, effective viscosity, porous media, Brinkman model6575http://jafmonline.net/JournalArchive/download?file_ID=15259&issue_ID=202N.Srivastavaneetusri_81@rediffmail.com`No`

`A. K.Singhashok@bhu.ac.in``NoDepartment of Mathematics, Institute of Science, Banaras Hindu University, Varanasi-221005, India`