Numerical Investigation on the Fluid Flow and Heat Transfer in the Entrance Region of Wavy Channel

In this study, the fluid flow and heat transfer in the entrance region in a converging-diverging channel with sinusoidal wall corrugations are investigated. Numerical solutions are obtained using the control-volume finite-difference method. Development of the hydrodynamic, thermal fields, Nusselt number and viscous constraint are presented for different flow rates, wall corrugations severity and Prandtl number values. In the channel entrance zone, the viscous constraint tangential as well as the local Nusselt number are characterized by a very fast decrease and their amplitudes increase with increasing the wall corrugations and the Reynolds number. The periodicity character as well as the maximal velocity are influenced by variations of the rate corrugation and the Reynolds number.