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研究生:簡欣堂
論文名稱:水和液態冷媒在小管內之單相熱傳及壓降實驗分析
指導教授:楊建裕楊建裕引用關係
學位類別:碩士
校院名稱:國立中央大學
系所名稱:機械工程研究所
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:1999
畢業學年度:87
語文別:中文
論文頁數:71
中文關鍵詞:小管徑單相熱傳壓降
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本研究以電熱絲直接加熱管外側的方法,量測水及液態冷媒R-134a在直徑1.10 mm、1.41 mm以及1.77 mm、2.49 mm、4.01 mm的微小圓管內,單相流體的壓降與熱傳係數,水的實驗雷諾數範圍在200~12,000,冷媒的實驗雷諾數範圍在1000~50000,進口溫度皆為25℃。
實驗結果顯示,水在管內紊流的摩擦係數和Blasius方程式的預測值十分的吻合。而冷媒在管內紊流的摩擦係數比Blasius方程式高10%。
水在管內層流時,實驗紐賽數數和理論值(等熱通量之紐賽數等於4.36)接近,而在紊流時,其實驗數據逐漸偏向Gnielinski方程式。而冷媒在五種管徑的紊流紐賽數與Gnielinski預測值高約12.8%。另外,實驗結果顯示,層流紊流轉換區的發生雷諾數隨管徑縮小而變大。
無論在摩擦係數和紐賽數數據上,水和冷媒都有相當的差異,推測的可能原因,在於微小管子中的熱傳及壓降,將受到流體的性質影響,而不同的流體性質,會有不同的實驗結果產生。在這方面我們提供往後的研究者一個新的研究方向去探討之。

摘要…………………………………………………………..i
目錄…………………………………………………………...ii
圖目錄………………………………………………………... iv
表目錄………………………………………………………..v
符號說明……………………………………………………...vi
第一章 前言…………………………………………………..1
1.1 研究背景…………………………………………….1
1.2 研究目的…………………………………………….2
第二章 文獻回顧……………………………………………..3
2.1 管內摩擦係數………………………………………3
2.1.1 平滑管之摩擦係數……………………………4
2.1.2 粗糙管之摩擦係數…………………………...5
2.1.3 微小管之摩擦係數……………………………8
2.2 管內的熱傳分析……………………………………11
2.2.1 平滑管內的熱傳係數…………………………11
2.2.2 微小管之熱傳係數……………………………15
第三章 實驗系統與方法……………………………………...20
3.1 簡介……………………………………………………20
3.2 測試段…………………………………………………21
3.3 水循環系統..……………………….………………….21
3.4 冷媒循環系統…………………………………………. 25
3.5 水系統實驗過程………………………………………. 27
3.5.2 系統測漏……………………………………….. 27
3.5.2 填充流體……………..………………………… 28
3.5.3 實驗步驟…..…….…..………………………….28
3.6 冷媒系統實驗過程…………………………………….29
3.6.1 系統測漏………………….…………………….29
3.6.2 系統冷媒填充……………….………………….29
3.6.3 實驗步驟……………………………………….. 30
3.7 流體的物理特性………………………………………. 30
3.8 實驗數據分析….……………………………………… 30
3.8.1 壓降分析……………………………………….. 31
3.8.2 測試管內的熱傳係數…………………………… 31
第四章 實驗結果與討論………………………………………. 47
4.1 管內摩擦壓降…………………………………………47
4.2 管內熱傳係數…………………………………………48
第五章 結論……………………………………………………63
參考文獻……………………………………………………….65
附錄………………………………………………………………70

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