Numerical turbulent convective heat transfer and fluid flow in complex channels

摘要

This investigation concerns numerical turbulent heat transfer and fluid flow in complex channels for fully developed periodic state. Numerical application of different turbulence models for forced convective heat transfer in three dimensional channels are presented. It also concerns prediction of secondary motions and temperature distribution in straight and corrugated ducts with different cross section area. The standard linear k-e and Speziale's non-linear k-e models with wall functions are applied to calculate the turbulent shear stresses. SED, GGDH and WET models are used to predict the turbulent heat fluxes. The overall thermal-hydraulic performance is presented in terms of friction factor and Nu-number. Some formulas are also presented to estimate the Nu-number in various wavy channels. The numerical approach is based on the finite volume technique with non-staggered grid arrangement. Rhie-Chow interpolation with SIMPLEC-algorithm is used. The convective terms are treated by hybrid, MUSCL, van Leer and QUICK schemes while the diffusive terms are treated by central difference scheme. The fully developed turbulent state is achieved by imposing periodic conditions in the main flow direction. In general, a numerical method for calculation of turbulent convective heat transfer in complex channels is presented. 4 refs, 3 figs