碩士 / 建國科技大學 / 機械工程系暨製造科技研究所 / 100 / This study experimentally investigated the fluid flow and heat transfer characteristics of the pin-fin heat sink partially filled with copper foams under the oncoming air flow. The copper foams would be filled into the longitudinal interval spaces of the pin-fin heat sink. The dimensions of the pin-fin heat sink including a 5 mm-thickness spreader were fixed: 120 mm in length, 60 mm in width and 32 mm in height. The porosity of copper foams was 0.97. Relevant variables were the side length of the pin fin (s=5 and 6.3 mm), the space between pin fins (gL = 6.33-18.0 mm and gT = 7.13-22.5 mm), the pore density of the copper foams (PPI = 20 and 50) and the Reynolds number (Re = 3208-50069). The experimental results indicated that, at the same Re, the Model A1C1 ( s = 6.3 mm, gL = 6.33 mm, gT = 7.12 mm and PPI=50) and Model A1C2 ( s = 6.3 mm, gL = 6.33 mm, gT = 7.12 mm and PPI=20) had the maximum average Nusselt number (Nu). Besides, at the same pumping power, the Models A1 ( s = 6.3 mm, gL = 6.33 mm and gT = 7.12 mm ) and A1C1 had the better heat transfer performances. For the low and medium pumping powers, the Model A1 had better performances. However, the heat transfer performances of the Model A1C2 would be better than that of the Model A1 when the dimensionless pumping power exceeded 107. It demonstrated that the pin-fin heat sink filled with copper foams had the high heat-transfer potential for the system operated at the high pumping power.
| Identifer | oai:union.ndltd.org:TW/100CTU05490009 |
| Date | January 2012 |
| Creators | Y. Y. Chou, 周彥儀 |
| Contributors | S. C. Tzeng, 曾憲中 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 111 |
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