Effect of Shallow Dimple on Cylindrical Surface for Heat Transfer and Pressure Penalty

Effect of shallow dimples on convective heat transfer from cylinder surface is investigated numerically. Relative assessment of circular cylinder and cylinder with shallow dimple on full surface of the cylinder and shallow dimple only on downstream surface of the cylinder are done for heat transfer and pressure penalty. Two-dimensional numerical investigations are performed for air with velocity in the range of 1–5 m/s. Turbulence is modeled using RSTM closer model. The comparison of heat transfer rate for all the reported cases reveals that inclusion of shallow dimple on circular cylinder enhances heat transfer rate. Heat transfer rate augments by 20% in case of full shallow dimple surface compared to plain cylindrical surface. In case of dimple on downstream surface of the cylinder, heat transfer is 10% more than plain surface. Cylinder with shallow dimple downstream outperforms in terms of heat transfer rate and pressure penalty.