Improved modeling of turbulent forced convective heat transfer in straightducts

This investigation concerns numerical calculation of turbulent forced conve ctive hear transfer and fluid flow in their fully developed state at low Re ynolds number. The authors have developed a low Reynolds number version of the nonlinear k-epsilon model combined with the heat flux models of simple eddy diffusivity (SED), low Reynolds number version of generalized gradient diffusion hypothesis (GGDH), and wealth proportional to earning X time (WE T) in general three-dimensional geometries. The numerical approach is based on the finite volume technique with a nonstaggered grid arrangement and th e SIMPLEC algorithm. Results have been obtained with the nonlinear k-epsilo n model, combined with the LamBremhorst and the Abe-Kondoh-Nagano damping f unctions for low Reynolds numbers.