Experimental Investigation of Flow Obstacles Effect on Single Phase Heat Transfer

Abstract

Previous experimental studies of the effect of flow obstacles on heat transfer have been performed on bun-dle suggest an analogy between the increased pressure drop at the flow obstacle such as a grid spacer, and the enhancement in wall heat transfer. Right behind the blockage, the flow decelerates and turbulent wakes are generated. The wakes agitate the wall boundary layer and enhance the heat transfer from the wall. However it was generally assumed in the prediction of the heat transfer enhancement, that that heat flux, mass flux and shape of the flow obstruction do not play a major role on the heat transfer enhancement.