Numerical Study on Heat Transfer and Pressure Drop of an Integrated Array-Jets and Pin-Fins Cooling Configuration

In order to investigate the effects of array-jets and pin-fins coupling structure on comprehensive cooling effect of hot components, a numerical study was performed to investigate the flow and heat transfer characteristics of an integrated array-jets and pin-fins cooling structure, with the main concern on the effects of pin-fins arrangement with respect to the impinging holes (inline and staggered modes) and fin-to-hole diameter ratio (dp/dj=0.5, 1, 2). In order to consider the highly-coupling feature of heat conduction and heat convection in the integrated cooling structure, an equivalent convective heat transfer coefficient on the heated side of target plate was introduced. By using the convective heat transfer coefficient on targeting surface and the equivalent convective heat transfer coefficient on heated side of target plate, an evaluation on the comprehensive performance of integrated cooling structure was made. The results show that, compared with the smooth target surface, the heat transfer on the target surface with parallel and cross rows of spoiler columns increases by about 30% and 10%, and the inline mode of pin fins is more pronounced on enhancing the convective heat transfer when compared to the staggered mode. Simultaneously, the pressure loss ratio in the inline mode is otherwise less than the staggered mode. With regard to the effect of fin-to-hole diameter ratio, it is found that comprehensive performance evaluation based on the equivalent convective heat transfer coefficient on heated side of target plate is significantly different from that based on the convective heat transfer coefficient on targeting surface. © 2020, Editorial Department of Journal of Propulsion Technology. All right reserved.