3D NUMERICAL INVESTIGATION OF TURBULENT FORCED-CONVECTION IN WAVY DUCTS WITH TRAPEZOIDAL CROSS-SECTION

The present investigation is an extension of the authors' previous wor k on ducts with different cross sections. It concerns application of t urbulence models for forced convective heat transfer in three-dimensio nal corrugated or wavy ducts. Different wavy ducts with fully develope d flow and temperature fields are considered. The numerical approach i s based on the finite volume technique with a nonstaggered grid arrang ement. For handling the pressure-velocity coupling the SIMPLEC-algorit hm is used. Cyclic boundary conditions are imposed in the main flow di rection to achieve fully developed conditions. The nonlinear k-epsilon model of Speziale with wall functions is used to calculate the turbul ent stresses. The simple eddy diffusivity concept is applied to calcul ate the heat fluxes, but the GGDH and the WET methods are also used in some cases. The influence of the geometry parameters and comparison b etween different ducts are presented in terms of the friction factor a nd average Nusselt number. In particular the secondary velocity field and the cross sectional temperature distributions are investigated.