Transient Mixed Convection In Channels Partially Heated Filled With A Porous Medium In Non-Local Thermal Equilibrium

摘要

In this paper, reference is made to transient mixed convection in air in a vertical channel with porous media and the two principal flat plates at uniform temperature with adiabatic extensions downstream. The numerical analysis is carried out in transient laminar, two dimensional and in nonlocal thermal equilibrium. The physical domain consists of two parallel plates which form a channel and the adiabatic extensions downstream to the heated walls. Both plates are heated at uniform temperature. The fluid between the two plates is air. The study is carried out employing BrinkmanForchheimer-extended Darcy model and two energy equations. The flow in the channel is assumed to be two-dimensional, laminar, incompressible. Results in terms of local Nusselt number profiles as a function of mass flow rate, adiabatic extensions length, wall temperatures and channel spacing are presented. Average Nusselt numbers are presented for different values of characteristic parameters.