Influence of rayleigh number on the passive cooling of a heat-generating solid body

Abstract

A numerical study has been conducted to assess the convective heat transfer inside an enclosure containing a heat-producing element. The vertical sides of an enclosure are kept at a constant temperature, while the horizontal boundaries are thermally insulated. Heat generating element is assumed to be placed in the central part of the considered cavity. The governing system for the considered problem is tackled by adopting the control volume approach. Rayleigh number (104 < Ra < 106) and the walls emissivity (0 < eps < 1) are the governing parameters. The influence of the specified parameters on the stream function and temperature isolines, as well as the convective and radiative Nusselt numbers, are presented. Results concluded that the surface emissivity of boundaries and Rayleigh number have a considerable impact on the cooling efficiency of the heat- producing body. doi 10.33184/bulletin-bsu-2026.1.1