トンネル構造を有する多孔型アルミニウム伝熱面を用いた高発熱素子のプール沸騰冷却

抄録

We focus on the saturated pool boiling with aluminum heat transfer surfaces. Considering the matching of aluminum surface with working fluid, fluorine refrigerant HFE7000 is used. We have used seven types of heat transfer surface (smooth and six curl-skive surfaces: fins A, B, C, D as group 1, fins E, F as group 2). Curl-skive fin surfaces have many fine tunnel structure machined by squashing of fins after biting. Curl-skive fin A is considered as a standard which has similar specification with previous high performance surfaces. Curl-skive fins B, C and D are shifted in fin width, gap width, fin pitch and fin height from curl-skive fin A. Curl-skive fin C has the closest structure and largest number of tunnels in group 1. Curl-skive fins E, F in grope 2 have closer structure than curl-skive fin C. Absolute pressures cited are 0.10MPa, 0.14MPa and 0.18MPa. Comparing the heat transfer surface type, curl-skive fin C shows the highest heat transfer performance among all heat transfer surfaces examined in this study. And, heat transfer performance of curl-skive fin C is 4.8 times higher than that of smooth surface and 2.8 times higher than that of curl-skive fin A under 0.14MPa. On the other hand, curl-skive fins E, F show pour performance which is almost equivalent to that of smooth surface.