| 研究生: |
葉竣達 Juin-Da Ya |
|---|---|
| 論文名稱: |
半弧形無蕊式熱管熱傳性能實驗 |
| 指導教授: |
楊建裕
Chien-Yuh Yang |
| 口試委員: | |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 機械工程學系 Department of Mechanical Engineering |
| 畢業學年度: | 89 |
| 語文別: | 中文 |
| 論文頁數: | 130 |
| 中文關鍵詞: | 太陽能熱水器 、無蕊式 、熱管 、半弧形管 、表面張力 |
| 相關次數: | 點閱:7 下載:0 |
| 分享至: |
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根,另外兩圓形管,內徑為4.4mm及2.4mm,前者填充率35及65%各
一根,後者填充率65%一根。兩圓形管與半弧形管的水力直徑與溼周
邊長相似。三根熱管的總長度皆為300mm,等分為蒸發、絕熱及冷凝
等三段。熱傳機制、最大熱傳量和傾斜角的影響皆已量得並討論。
直徑4.4mm之圓形管,其填充率65%,在一加熱功率間,發生蒸
發段溫度大量降低且轉為均勻,使蒸發段熱傳機制由池沸騰轉為兩相
對流沸騰,蒸發段熱阻降低約40%,冷凝段熱阻增加約50%。填充率
降為35%時,亦有此種熱傳機制變換,但轉換後蒸發段熱阻亦不再隨
加熱功率增加。但不會造成熱阻突然變化。此種熱傳機制變換情形在
直徑2.4mm圓形管並未出現,而半弧形無蕊式熱管則是不明顯。
圓管直徑4.4mm 及2.4mm 實驗所得最大熱傳量與Imura 等人
[1983]、Faghri 等人[1989]之修正式之預測值,約相差20~30%。實驗
測得半弧形管的最大熱傳量與直徑4.4mm 圓管相近,與直徑2.4mm
圓管相比,約為2.5 倍大。
半弧形管內液體夾於兩邊,減小液汽流動界面,降低了傾斜角度
對熱阻的影響。夾角的表面張力使蒸發段壁面保持潤濕,提高其有效
熱傳導係數。但冷凝段熱阻過高,必須加以改善以提升整體性能。
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