中文摘要：

本文使用瞬态测量技术对球型/椭球型凹陷冷却结构内的流阻性能和局部传热性能进行了实验研究。凹陷深度与通道高度之比为0 2,凹陷投影赢径与通道高度的比为1。冷却通道的高度为10 mm,基于通道水利直径和平均速度的雷诺数为8500~51000。实验结果表明,充分发展段的球型凹陷的传热性能是光滑通道传热性能的1.45~1.55倍,而其摩擦因子是光滑通道摩擦因子的1.25~1.75倍;椭球型凹陷的传热性能比球型凹陷低4%~15%,摩擦因子高5%左右。本实验研究获得了球形凹陷/椭球型凹陷详细的局部传热性能分布,凹陷后半部分的传热性能明显高于凹陷前半部分的传热性能。球型凹陷的总体热性能参数比椭球型凹陷高约14%。

英文摘要：

An experimental study using a transient TLC thermography technique has been conducted on the flow frictioncharacteristics and local heat transfer performance in a channel with spherical/elliptical dimples.Height of the channel is 10 mm.The ratio of dimple depth to duct height is 0.2 and the ratio of print diameter to duct height is 1.0.Reynolds number,which is based on the hydraulic diameter,is tested in high range values from 8500 to 51000.The research shows that the Nusselt number of circular dimples is 1.45~1.55 times that of smooth flat,with friction factor is1.25~1.75 times that of smooth flat.However,the Nusselt number of elliptic dimples is 4%~15% lower than circular dimples＇ and friction factor is 5% higher.This study has obtained local heat transfer coefficients on the circular/elliptic dimple walls.The heat transfer coefficients on the latter part of dimples is higher than that on the front part.Theoverall thermal performance factor（Pf） of circular dimples is 14% higher compared with elliptic dimples.