The performance of an explicit algebraic stress model is assessed in predicting the turbulent flow and forced heat transfer in straight ducts, with square, rectangular, trapezoidal and triangular crosssections, under fully developed conditions over a range of Reynolds numbers. Iso-thermal conditions are imposed on the duct walls and the turbulent heat fluxes are modeled by gradient-diffusion type models. At high Reynolds numbers (>105), wall functions are used for the velocity and temperature fields; while at low Reynolds numbers damping functions are introduced into the models. Hydraulic parameters such as friction factor and Nusselt number are well predicted even when damping functions are used, and the present formulation imposes minimal demand on the number of grid points without any convergence or stability problems.
|Title of host publication||Proceedings of the 3rd International Symposium on Turbulence, Heat and Mass Transfer|
|Number of pages||8|
|Publication status||Published - 2000|
|Event||3rd International Symposium on Turbulence, Heat and Mass Transfer - Nagoya, Japan|
Duration: 2 Apr 2000 → 27 Apr 2000
|Conference||3rd International Symposium on Turbulence, Heat and Mass Transfer|
|Period||02/04/2000 → 27/04/2000|