Numerical prediction of fluid flow and heat transfer overheated modules using the stand ard k - epsilon model and low reynolds number models

摘要

A comparative study of the standard k - epsilon model and two low Reynolds number models as applied to developing tubulent fluid flow and heat transfer in a channel with surface-mounted heat generating modules is considered. The channel is assumed to the formed between two adjacent circuit boards with surfacemounted heat generating modules mounted on a single side of each board. Claculation is performed using both standard k - epsilonmodel and low Reynolds number models for a Reynolds number range of 2000 to 7000, and a Prandtl number of 0.7. The predictions of both pressure drop and heat transfer coefficient over the modules are compared with selected experimental data. The comparison showed that the low Reynolds number model based on Jones and Launder (1972) gives good predictions at Reynolds number range of 2000 to 5000. At higher Reynolds numbers, such as Re chemical bounds 7000, the standard k - epsilon model results in better predictions.