Numerical investigation on laminar slot-jet impinging on a surface at uniform heat flux in a channel partially filled with a porous medium

Jet impingement of a cold fluid is an efficient cooling method of a heated surface. Jets employed together with porous media with high porosity and thermal conductibility, such as aluminum foams, allows to improve the heat removal from a heated surface. In the present study, a parallel-plate channel filled partially with a high permeability porous medium and a single slot jet impinging on the porous medium is investigated numerically. The opposite wall to the air slot jet is partially heated at uniform heat flux. The porous medium is modeled using the Brinkman-Forchheimer-extended Darcy model that takes into account viscosity and inertia effects. The analysis in the porous medium is accomplished under local thermal equilibrium conditions and a two-dimensional numerical model is developed to evaluate the hydrodynamic and heat transfer characteristics within the channel. The investigations are carried out for 1<Pe<1000 and 10<Ra∗<1000 at several thickness of the porous medium. Results indicate that for the channel with a porous medium thickness equal to the channel gap the highest average Nusselt number are detected.