Surrogate Modeling for Optimization of Dimpled Channel to Enhance Heat Transfer Performance

DIMPLES on solid surfaces usually used in cooling passages of a turbine blade along with ribs, pin fins, etc., as heat transfer augmentation devices, prevent the development of the thermal boundary layer and increase production of turbulent kinetic energy, and thus enhance turbulent heat transfer as reviewed by Ligrani et al. [1]. Inevitably, the surface deformations increase pressure loss in flow passage. The shape optimization of the dimpled surface, thus, is indispensable in compromising between enhancement of heat transfer and reduction of pressure loss. Kim and Choi [2] performed shape optimization of the dimpled channel to enhance turbulent heat transfer using the response surface method and they showed that the heat transfer rate increases by shape optimization.