Author : Yogesh P Bhatt and D. B. Hulwan

The development of high performance thermal systems has stimulated interest in methods to increase heat transfer using different enhancement techniques. Improvements in the performance of thermal systems can lead to substantial cost, space and material savings. Roughness enhancement method is one of the most effective ways to improve the heat transfer performance with small increase of pressure drop. Compared to other passive enhancement geometric forms, three-dimensional roughness method holds more potential because of the high levels of enhancement and energy efficiency. One innovative technique, which is the subject of a number of recent investigations, involves the use of dimples on tubes, plates, surfaces of channels etc. as they are competitive in comparison to performance and cost of other enhancement techniques. This paper makes an attempt to review the experimental and numerical investigations carried out using dimples as passive enhancement technique.

Keywords: Heat transfer enhancement, Dimples, Reynolds Number, Nusselt Number, Heat transfer coefficient

Article published in International Journal of Current Engineering and Technology, Vol.6, No.3 (June-2016)