Fundamental studies on buoyancy-aided conjugate mixed convection with surface radiation from a discretely heated vertical electronic board

Abstract

The present paper reports numerical results related to the problem of buoyancy-aided conjugate mixed convection with surface radiation from a discretely heated vertical electronic board. The board is equipped with three flush-mounted discrete heat sources of identical dimensions and volumetric heat generation, while air is used as the cooling medium. The governing continuity, Navier-Stokes and energy equations are taken without boundary layer approximations and are solved using finite volume method with the help of stream function–vorticity formulation. An extended computational domain is considered and is discretised with 151 grids along and 111 grids across the board. The nature of variation of local board temperature distribution, peak board temperature, local drag coefficient, mean friction coefficient and relative contributions of mixed convection and radiation to board heat dissipation with reference to some of the pertinent independent parameters has been looked into. Also, some of the contour plots related to isotherm distribution in the computational domain for typical sets of working conditions have been provided.