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曾憲中11

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Tzer-Ming Jeng, Sheng-Chung Tzeng, Chang-Feng Li, Rui Xu, Yen-Hao Huang

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圓柱體於測項衝擊冷卻下的熱傳特性

Thermal behavior of a cylinder under the lateral impinging cooling

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中國機械工程學會第三十屆全國學術研討會

Chinese Mechanical Engineering Society National Conference on the thirtieth

Keywords：圓柱體、側向衝擊冷卻、熱傳、實驗

Abstract：本研究以實驗方法探討圓柱體於側向衝擊冷卻嚇得熱傳特性，圓柱體的尺寸固定，變動噴射雷諾數(Rej = 655~60837)、圓柱體直徑與噴流寬度的比例(D/w =2~16)、相對衝擊距離(L/w =1~16，L是噴嘴與圓柱體間最短距離，結果顯示平均紐塞數(Nu)隨Rej增大而增加；但隨D/w對Nu的影響會隨L/w增加而減小；而當L/w增大時，Nu會先增大然後衰減，換言之，會有特定臨界L/w值將隨D/w增大而變大；最後，本研究提出合理而精確的Nu經驗公式，本文結果將可最為動力機械相關冷卻系統實際設計得參考。

This study experimentally investigated the heat transfer characteristics of a cylinder under lateral air impinging jet. The height and diameter of the cylinder were fixed, and the variable parameters were as follows:(1) the jet Reynolds number (Rej=655~60237);(2) the ratio of the cylinder diameter (D) to the nozzle width (w) (D/w=2~16); (3) the relative jet-impinging distance (L/w=1~16, L is the shortest nozzle-to-cylinder distance). The results showed that the average Nusselt number (Nu) increased with the increase of Rej, and decreased with the increase of D/w. The influence of D/w on NU decreased with the increase of L/w. In other words, there is a critical L/w value that can produce the highest Nu, and the critical L/w value increased with D/w. Finally, this study proposed reasonable and accurate empirical correlations of Nu. All the results can provide reference for practical design of the cooling system in relevant power machinery. 

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