Numerical Simulation of Vortex Enhancement of Heat Transfer under Conditions of Turbulent Flow Past a Spherical Dimple on the Wall of a Narrow Channel

Abstract

Analysis is performed of studies into numerical simulation of a vortex flow and heat transfer in the vicinity of a dimple on a flat wall. To calculate the turbulent regime in a narrow channel with a spherical dimple on one of the walls, a multiblock algorithm for solving the Reynolds and energy equations is used which is based on structured partly overlapping grids and involves the use of the zonal k–ω model of shear stress transfer proposed by Menter. A tornado-like mechanism of enhancement of heat transfer in a spherical dimple of varying depth is analyzed in detail. Special attention is given to the rearrangement of the vortex structure and to a jumplike enhancement of heat transfer from wall with dimples.