EFFECT OF MATERIAL COMPOSITION AND LOCALIZED HEAT-GENERATION ON TIME-DEPENDENT CONJUGATE HEAT-TRANSPORT

Time-dependent conjugate conduction/convection direct numerical simula tions of four rib configurations that differ in material composition a nd distribution of internal heat generation are conducted in laminar a nd transitional grooved-channel flows. The effect of material composit ion, concentration of heal generation and flow regime on the spatial d istribution of temperature, heat flux and Nusselt number along the sol id-fluid interface is investigated. Furthermore, the distribution of i nternal heat generation is found to affect strongly the convective res istance at the solid-fluid interface of the rib, leading to a nonmonot onic relationship between convective heat transport and Reynolds numbe r for the range of parameters investigated in the configurations with local heat generation.