Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/2631
標題: 可變厚度平板鰭片之熱傳分析
Thermal Analysis of Plate Fins With Variable Thickness And Constant Height For Air-Cooled Electronic Modules
作者: 廖文川
Liao, Michael
關鍵字: laminar flow;層流;plate fins;plate sharpness;平板鰭片;尖銳度參數
出版社: 機械工程學系
摘要: 
中文摘要
本研究使用套裝軟體Flotherm對層流狀態下之可變厚度平板鰭片進行熱傳分析。本文模擬二種不同熱傳導係數(k=180W/m-K和385W/m-K)、二種不同展弦比(Aspect ratio)、尖銳度(Plate Sharpness)範圍a = 0.1,0.2,0.3,...,0.8,0.9,1等參數之平板鰭片的熱傳分析,共有四十種組合。
經由數值模擬分析結果顯示,在同一雷諾數,相同展弦比下,可從可變厚度平板鰭片之尖銳度參數a = 0.1,0.2,0.3,...,0.8,0.9,1中找出一種底座溫度最低的鰭片。在同一雷諾數下,k=180W/m-K,展弦比在 = 的條件下,a=0.8的鰭片有最佳的散熱性能;而在k=385W/m-K,展弦比在 = 的條件下,a=0.7的鰭片有最佳的散熱性能。在同一雷諾數下,相同材質,展弦比在 = 的條件下,可變厚度平板鰭片散熱性能優於均勻厚度平板鰭片。
在同一雷諾數下,相同材質,且展弦比 = 的條件下,從節省材料及加工的角度,選用尖銳度參數a=1的平板鰭片,其散熱性能優於其他(a=0.1 ~ 0.9)鰭片。

Abstract
In this study, a computational fluid dynamics (CFD) package of Flotherm was used to investigate the thermal analysis of plate fins with variable thickness and constant height for an electronic module in laminar flow. The simulated parameters are two kinds of thermal conductivity (k=180W/m-K and 385 W/m-K) , two different aspect ratio of plate fins, and plate sharpness(a=0.1~1) so there are the analysis results of 40 sets shown in present analysis.
At the same Reynolds number and aspect ratio, the calculated results at various plate sharpness parameters(a=0.1~1) are shown. In the present study, We can find the optimum heat dissipation of base fin plate. At the same Reynolds number, k=180W/m-K, at the aspect ratio H/L=1/3, the heat dissipation of plate fin at plate sharpness a=0.8 is best; At the same Reynolds number, k=385W/m-K, at the aspect ratio H/L=1/3, the heat dissipation of plate fin at plate sharpness a=0.7 is best.At the same Reynolds number and material, at the aspect ratio H/L=1/3, the heat dissipation of the plate fin with variable thickness and constant height is superior to the plate fins with uniform thickness.
At the same Reynolds number and material, at the aspect ratio H/L=1/3, the heat dissipation of plate fin at plate sharpness a=1 is better than the others sharpness a=0.1~0.9.
URI: http://hdl.handle.net/11455/2631
Appears in Collections:機械工程學系所

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