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研究生:曾威凱
研究生(外文):Tseng, Wei Kai
論文名稱:迴路式熱虹吸之冷凝器研究
論文名稱(外文):Experiments on the Condenser of Loop Thermosyphon Heat Pipes
指導教授:王訓忠
學位類別:碩士
校院名稱:國立清華大學
系所名稱:動力機械工程學系
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2014
畢業學年度:102
語文別:中文
論文頁數:70
中文關鍵詞:熱虹吸熱管冷凝器
相關次數:
  • 被引用被引用:0
  • 點閱點閱:163
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  • 下載下載:14
  • 收藏至我的研究室書目清單書目收藏:2
本研究以實驗觀察迴路式熱虹吸熱管之垂直冷凝器的冷凝現象,主要的實驗參數為冷凝器的構造與表面親疏水性,包括:表面做親水處理之銅管、表面做疏水處理之銅管,以及表面做親水處理之溝槽管。三種冷凝管之冷凝效率依序為疏水銅管、溝槽銅管,與親水銅管,疏水銅管之冷凝熱阻可低於親水銅管達2-5倍之多;溝槽銅管之冷凝熱阻約為親水銅管的一半。疏水銅管之冷凝屬滴式凝結,凝結水以間歇方式流下,當增長最快的上段液滴達臨界尺寸後即迅速落下,路徑中掃清下方的液滴;親水溝槽管與平滑銅管皆為膜式凝結,其中親水銅管內冷凝液膜受水的表面張力影響,在流下的過程中會聚集於管圓周的某區域,使壁溫沿圓周呈現非均勻分佈。親水溝槽管中的溝槽提供毛細力,使液膜厚度沿圓周呈現均勻分佈,其上段中之冷凝水因可聚集於溝槽中,故溝槽管的上段熱阻為三者中的最小,但溝槽壁形成較大摩擦流阻而減緩冷凝水流下的速度,故溝槽管下段中的液膜增厚幅度為三者中最大。此外,親水銅管與親水溝槽銅管下方迴路中冷凝水位均有明顯震盪,平均冷凝水位主要受蒸汽摩擦壓降影響。
摘要 i
誌謝 ii
目錄 iii
圖表目錄 v
符號表 viii
第一章 緒論 1
1.1研究背景 1
1.2基本原理與文獻回顧 2
1.2.1熱虹吸熱管原理 2
1.2.2迴路式熱虹吸熱管 3
1.3影響管內冷凝性能之參數 8
1.4研究目的 14
第二章 實驗設備與方法 19
2.1簡介 19
2.2 迴路式熱虹吸實驗 19
2.2.1實驗裝置 19
2.2.2實驗架構與配置 22
2.2.3實驗步驟 23
2.2.4實驗參數與實驗參數計算 24
第三章 實驗結果與討論 41
3.1冷凝過程 41
3.1.1親水銅管 41
3.1.2疏水銅管 44
3.1.3溝槽管 47
3.2冷凝熱阻 48
3.3 蒸發熱阻 50
3.4 蒸發器與液體通道水位差ΔH 50
第四章 結論 63
參考文獻 65
附錄 銅管外壁溫度量測準確度之數值檢驗 69

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