Abstract
In order to improve the performance of the heat exchanger, it is important to enhance the heat transfer coefficient at the wall surface. It has been reported that the dimples are used in the heat exchanger to increase the cross-sectional area and agitate the fluid motion for enhancing the heat transfer coefficient. There are many experimental studies on effects of multiple dimples on flow characteristics. However, there are few experimental reports which comparing the turbulent-flow characteristics on dimple shapes. Regarding the turbulent-flow characteristics which are exerted a single elliptical dimple, three-dimensional flow and Reynolds stress measured by a particle image velocimetry experiments. Furthermore, in order to explore the effect of installation angle of dimple on heat transfer, it investigated the difference in the characteristics of the flow field on dimple which installed different angle and the factors that improve the heat transfer performance and the flow agitation performance.
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