Number：

04095015

Download

PDF

Name：

曾憲中- Sheng-Chung Tzeng

Titles：

Associate professor

Author：

Sheng-Chung Tzeng,Tzer-Ming Jeng,Jing-Piao Lin,Houng-Ju Liao

Paper name：

Thermal characteristics for a rotating pin-fin sink subject to a circular impinging jet

Name of activity：

第五屆精密機械與製造技術研討會論文集

Keywords：Heat transfer, Jet impingement, Pin-fin heat sink, Rotation

Abstract：This work experimentally investigated the heat transfer enhancement of jet impingement onto the rotating heat sink. Air was used as impinging coolant. while a square pin-fin heat sink with uniformly in-line arrangement was employed. Variable parameters were the jet Reynolds number (Re), the relative distance of nozzle-to-fin tip (C/d), the rotational Reynolds number (Re_r). The effects of Re. C/d and Re_r on the dimensionless temperature distributions and the average Nusselt number were presented. The results indicate that the heat transfer with pin-fins was 2~3 times without pin-fins. In the case of d=13mm, the heat transfer enhancement by rotation at Re≧15058 was not obvious. In the case of C/d≧1, the heat transfer enhancement by rotation at smaller Re was bigger than that in the case of C/d=0. Furthermore, Accoding to the base of Nu_Ω/Nu₀≧1.1 the results suggest that the substantial rotation appeared at Re_r/Re≧0.5 for the cases of d=13mm.

Back