HEAT TRANSFER ENHANCEMENT THROUGH DIFFERENT CIRCULAR DIAMETRICAL DIMPLE SURFACE UNDER FORCED CONVECTION –AN EXPERIMENTAL APPROACH

M.A.Dafedar, Mujtabalayeeq Inamdar, MohemmedTaher Mujawar, MohammadIdress urf Shahid Inamdar

Abstract: The prime objective of present work is to study experimentally the heat transfer enhancement through different circular diametrical dimple surfaces in longitudinal and lateral directions. In this paper horizontal rectangular plates of Stainless Steel and Galvanised Iron with different circular diametrical dimples (like 11mm , 14mm ) for in-line arrangements were studied in forced convection with varying laminar external flow condition. The various parameters considered for study are Reynolds Number, Nusselt number, Prandtl Number, Co-efficient of Friction, Heat transfer coefficient and heat transfer rate for a constant Prandtl number (0.698) It has been found that the heat transfer coefficient and heat transfer rate increases for various dimple surfaces as compared to plane surface. It has been also found that the heat transfer coefficient and heat transfer rate increases along longitudinal direction as compared to lateral direction. And it is seen that heat transfer rate is maximum for larger diameter (14mm) of dimple. For circular dimples, heat transfer enhancements (relative to a flat plate) were observed for Reynolds number range from 350 to 550

Keywords: Dimple plates, Forced Convection, Heat transfer Enhancement

DOI: https://doi.org/10.15623/ijret.2013.0207022