Experimental Analysis of Heat Transfer Enhancement in Different Dimpled Geometries Under Natural and Forced Convection

摘要

Heat transfer is energy in transit due to difference in temperature. The rate of heat transfer increases with the increment of temperature or by increment in surface area. The objective of this work is to study experimentally the heat transfer augmentation through different geometries of dimpled surfaces. In this work rectangular plates of different materials (like mild steel, aluminum) with different dimpled geometries (like square, and circular) for in-line arrangements are studied under natural and forced convection. The various parameters considered for study are Nusselt number, heat transfer coefficient and heat transfer rate. It is observed that the heat transfer coefficient and the rate of heat transfer increases for various dimpled surfaces as compared to flat surfaces. It is seen that the rate of heat transfer is maximum for square shaped dimples than circular dimples under forced convection.