STUDY OF COMBINED HEAT-TRANSFER IN A 3-DIMENSIONAL ENCLOSURE WITH A PROTRUDING HEAT-SOURCE

An experimental and numerical study of three-dimensional natural conve ction-radiation conjugate heat transfer in an enclosure adjacent to a heat-generating chip has been performed. A three-dimensional simulatio n model is developed by considering heat transfer phenomena by conduct ion, convection, and radiation. Radiative transfer is analyzed with th e discrete ordinates method Experiments were conducted to validate the numerical model. Comparisons with experimental data show that good ag reement is obtained when the radiation effect is considered. The effec ts of thermal conductivity of the substrate and power level of the chi p on heat transfer are investigated. If is shown that radiation is the dominant heat transfer mode and that the thermal conductivity of the substrate has important effects on heat transfer in the enclosure.