The present work concerns development and application of turbulence models for forced convective heat transfer in trapezoidal ducts. The numerical approach is based on the finite volume technique with a non-staggered grid arrangement. The pressure-velocity coupling is handled by using the SIMPLEC-algorithm. Cyclic conditions in the main flow direction are imposed. The standard k-#epsilon# model with wall functions is used as a feference. The non-linear k-#epsilon# of Speziale is applied to calculate the turbulent shear stresses. The turbulent heat fluxes are calculated by the simple eddy diffusivity (SED) concept, the GGDH method and the WET method. The overall comparison between the methods is presented in terms of the friction factor and average Nusselt number. In particular the secondary flow field is investigated.
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