論文名稱:

具發泡銅材填充之鰭柱散熱座於侷限式矩形衝擊噴流下之熱傳特性實驗研究

Experimental Study of Heat Transfer of the Pin-Fin Heat Sink Filled with Copper Foams Under a Confined  Rectangular  Impinging  Jet

研究生:

周彥儀

指導教授:

曾憲中

    學位類別:

碩士

          學號:

98017010

畢業學年度:

100

      出版年:

民101

關鍵字:

熱傳 Heat transfer

迎面空氣流 Oncoming air flow

鰭柱散熱座 Pin-fin heat sink

發泡銅材 Copper foams

摘要:

本研究以實驗方法探討具發泡銅材填充之鰭柱散熱座於迎面空氣流下之熱傳特性，將發泡銅材填充於方型鰭柱散熱座之軸向鰭柱間隙內，方型鰭柱散熱座之尺寸固定為：長120 mm × 寬60 mm × 高32 mm (含均熱板厚度5 mm)，發泡銅材之孔隙率為0.97。實驗之變動參數包括：鰭柱之邊長(s=5、6.3 mm)、鰭柱之軸向與橫向間隙(gL=6.33-18.0 mm、gT=7.13-22.5 mm)、發泡銅材之孔密度(20、50 PPI)、以及雷諾數(Re=3208-50069)。實驗結果指出在相同雷諾數下，A1C1模組 (s=6.3 mm、gL=6.33 mm、gT=7.12 mm、PPI=50) 與A1C2模組 (s=6.3 mm、gL=6.33 mm、gT=7.12 mm、PPI=20) 具有最佳的散熱能力；此外，在相同鼓風功率下，A1 ( s = 6.3 mm、gL = 6.33 mm、gT = 7.12 mm ) 與A1C2模組具有較佳的散熱能力，其中在中低鼓風功率下，A1模組的熱傳表現較佳，當無因次鼓風功率大於107時，A1C2模組的熱傳表現逐漸優於A1模組，顯示具發泡銅材之鰭柱散熱座在高鼓風功率下的高效散熱潛力。

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.