論文名稱:

具堆疊黃銅粒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 Packed Brass Beads Under a Confined  Rectangular  Impinging  Jet

研究生:

黃瓊瑤

指導教授:

曾憲中

    學位類別:

碩士

          學號:

98017012

畢業學年度:

99

      出版年:

民100

關鍵字:

衝擊噴流 Impinging jet

堆疊黃銅粒 Packed brass beads

鰭柱散熱座 Pin-fin heat sink

熱傳 Heat transfer

摘要:

本研究以實驗方法探討具堆疊黃銅粒之鰭柱散熱座於侷限式衝擊噴流下之熱流特性，採用空氣為冷卻流體，方型鰭柱散熱座之尺寸固定為：長120 mm × 寬60 mm × 高27 mm (不含均熱板)，變動參數包括：鰭柱邊長( s = 5－8 mm )、鰭柱間隙( gL = 2.66－18.0 mm、gT = 2.85－22.5 mm )、黃銅粒粒徑( d = 2、4、6 mm )與噴射雷諾數( Re = 1099－48543)等，將不同粒徑之黃銅粒填入不同鰭柱邊長與鰭柱間隙之鰭柱散熱座會產生不同的多孔性質，其對應之熱流特性也會產生變化。實驗結果指出在相同雷諾數下，具有最大平均紐塞數者為具堆疊黃銅粒之鰭柱散熱座A1B1模組( s = 6.3 mm、gL = 6.33 mm、gT = 7.12 mm、d = 2 mm )；在相同鼓風功率下，具有較大平均紐塞數者則為A4 ( s = 5.0 mm、gL = 2.66 mm、gT = 2.85 mm )、A1B3 ( s = 6.3 mm、gL = 6.33 mm、gT = 7.12 mm、d = 6 mm )與A4B1 ( s = 5.0 mm、gL = 2.66 mm、gT = 2.85 mm、d = 2 mm )等模組，尤其當無因次鼓風功率大於107時，A1B3與A4B1模組的表現將逐漸優於A4，顯示具堆疊黃銅粒之鰭柱散熱座在高鼓風功率下具有較佳之散熱潛力，本研究並提出平均紐塞數之經驗公式，供相關冷卻設計時之參考。

This study experimentally investigated the fluid flow and heat transfer characteristics of the pin-fin heat sink fully filled with brass beads under the confined rectangular impinging jet. The air was used as the coolant. The dimensions of the pin-fin heat sink were fixed: 120 mm in length, 60 mm in width and 27 mm in height (not including the spreader), Relevant variables were the side length of the pin fin ( s = 5－8 mm ), the space between pin fins ( gL = 2.66－18.0 mm and gT = 2.85－22.5 mm ), the diameter of the brass beads ( d = 2, 4, 6 mm ) and the jet Reynolds number ( Re = 1099－48543). The pin-fin heat sinks of various pin-fin side lengths (s) and pin-fin interval spaces (gL and gT ) filled with brass beads of various diameters (d) would result in different porous properties, leading the corresponding changes in the behaviors of the heat transfer. The results indicated that, at the same Re, the Mode A1B1 ( s = 6.3 mm, gL = 6.33 mm, gT = 7.12 mm and d = 2 mm ) had the maximum average Nusselt number (Nu). Besides, at the same pumping power, the Modes A4 ( s = 5.0 mm, gL = 2.66 mm and gT = 2.85 mm ), A1B3 ( s = 6.3 mm, gL = 6.33 mm, gT = 7.12 mm and d = 6 mm ) and A4B1 ( s = 5.0mm, gL = 2.66 mm, gT = 2.85mm and d = 2 mm ) had the better heat transfer performances. Furthermore, the heat transfer performances of the Modes A1B3 and A4B1 would be better than that of the Mode A4 when the dimensionless pumping power exceeded 107. It demonstrated that the pin-fin heat sink filled with brass beads had the high heat-transfer potential for the system operated at the high pumping power. Finally, this study provided the empirical formula of the Nu as the reference of the relevant cooling design.