Abstract—Over the past couple of years the use of dimples to enhance the heat transfer has increased tremendously. In this work an experimental investigation of the natural convection heat transfer over circular dimpled surfaces is carried out. The various heat transfer parameters considered for study are Nusselt number, heat transfer coefficient and heat transfer rate. From the obtained results, it can be concluded that large amount of heat transfer enhancement does takes place for the dimpled surfaces.

Index Terms—Natural convection, Dimples, Heat transfer enhancement, Compact heat exchanger

Cite: Faheem Akthar, Abdul Razak R Kaladgi, and Mohammed Samee A Dafedar, "Heat Transfer Enhancement Using Dimple Surfaces under Natural Convection-An Experimental Study," International Journal of Mechanical Engineering and Robotics Research, Vol. 4, No. 1, pp. 173-175, January 2015.