Transient response of discrete heat sources on a conducting board in the presence of cross flow mixed convection

The transient response of discrete heat sources on a conducting board of finite thickness in the presence of cross flow mixed convection has been analyzed in this study. In this type of flow, the orthogonal free and forced convection result in a three dimensional boundary layer flow. A numerical model is developed to simulate the actual device considering heat generation in the integrated circuit components, conduction of heat through the board and convection of heat from board surfaces to the fluid stream. The significance of the factors that influence heat transfer rate and surface temperature of these components were analyzed. The equations for conservation of mass, momentum, and energy were solved in their time-dependent form to determine the transient evolution of velocity and temperature profiles. The numerical model identified important dimensionless parameters such as Richardson number, Reynolds number, Fourier number, Prandtl number, dimensionless source spacing, and ratio of solid to fluid thermal conductivities. A parametric study revealed their influences