螺旋管熱交換器得益於其高熱傳性、設計的緊湊性、易於製造以及不容易產生熱應力變形等特性在工業界被廣泛使用。螺旋管會因為其幾何特性，在重力以及離心力的共同作用下產生二次流的現象，而此現象會造成螺旋管熱傳效果的提升；在進入雙相沸騰區後，由於主流速度的提升也將使二次流效應提升而使熱傳效果提升。
螺旋管熱交換器沸騰熱傳的現象是相當複雜的，且數值分析的研究是相當稀少且不足的，因此本論文將探討在不同的汽泡動力參數、紊流模式和壁面沸騰模式下來評估螺旋管熱交換器管側的熱傳效果；研究結果表明對於汽泡動力參數而言，汽泡脫離壁面的直徑選用Kocamustafaogullari and Ishii[38]模式與成核址密度選用Kocamustafaogullari and Ishii[40]模式的組合會比汽泡脫離壁面的直徑選用Tolubinski and D.M. Kostanchuk[37]模式與成核址密度選用Lemmert and Chawla[39]模式的組合更好的預測了螺旋管在雙相沸騰區的熱傳效果，紊流模式使用standard k-ε[18]對於熱傳系數的預測會略低於realizable k-ε[21]與SST k- ω [23]。壁面沸騰模式不管選用RPI Model[34]或是Non-equilibrium wall boiling model[36]對於螺旋管在進入雙相沸騰區後，周向溫度的預測與現有的實驗數據有所落差。因此，為了能夠模擬真實螺旋管熱交換器管側的熱力-水力特性，本論文也會分析在考量螺旋管壁面熱傳導效應下，評估螺旋管的熱傳效果。

Helical coil heat exchangers are widely used in industry due to their high heat transfer, compact design, easy manufacturing, and resistance to thermal stress deformation. Due to its geometric characteristics, the helical coil tube will produce a secondary flow phenomenon under the combined action of gravity and centrifugal force, and this phenomenon will enhance heat transfer effect of the helical coil tube. After entering the two-phase boiling region, the increase in mainstream velocity will also increase the secondary flow effect and enhance the heat transfer effect. The phenomenon of boiling heat transfer in helical coil heat exchangers is quite complex, and the research on numerical analysis is quite rare and insufficient. Therefore, this paper will explore the evaluation of the heat transfer effect on the tube side of the helical coil tube heat exchanger under different bubble dynamic parameters, turbulence model and wall boiling model. The results show that for the bubble dynamic parameters, the combination of the Kocamustafaogullari and Ishii model[38] for the bubble departure diameter and the Kocamustafaogullari and Ishii[40] model for the nucleation site density is better than the combination of the Tolubinski and D.M. Kostanchuk model[37] for the bubble departure diameter and the Lemmert and Chawla model[39] for the nucleation site density to predict the heat transfer effect of the helical coil tube in the two-phase boiling region. The prediction of heat transfer coefficient using standard k-ε[18] in turbulent flow model will be slightly lower than realizable k-ε[21] and SST k- ω[23]. Regardless of whether the RPI Model[34] or the Non-equilibrium wall boiling model[36] is used to the wall boiling model, after the helical coil tube enters the two-phase boiling zone, the prediction of the circumferential temperature is different from the experimental data. Therefore, in order to simulate the thermal-hydraulic characteristics of the tube side of a real helical coil tube heat exchanger, this paper will also analyze and evaluate the heat transfer effect of the helical coil tube taking account the heat conduction effect of the helical coil tube.

摘要 i
Abstract ii
致謝 iv
目錄 v
表目錄 viii
圖目錄 x
第一章 緒論 1
1.1 前言 1
1.2 研究動機與目的 3
第二章 文獻回顧 4
2.1 螺旋管沸騰熱傳相關實驗 4
2.2 螺旋管沸騰熱傳數值分析 8
2.3 螺旋管沸騰熱傳使用機器學習預測熱傳系數 12
第三章 數學模式、邊界條件與數值方法 13
3.1 單相流的數學模式 13
3.1.1 單相流的統御方程式 13
3.1.2 單相流的紊流模式 13
3.1.3 壁面函數(Wall function) 18
3.2 雙相流的數學模式 21
3.2.1 雙相流的統御方程式(Two fluid model[28]) 21
3.2.2 雙相流的紊流模式 25
3.3 壁面沸騰模式與汽泡動力參數 26
3.3.1 壁面沸騰模式 26
3.3.2 汽泡動力參數(bubble dynamics parameter) 28
3.4 邊界條件(boundary condition) 30
3.5 數值方法 31
第四章 螺旋管單相/雙相沸騰模式建立與結果分析 33
4.1 幾何模型的建立 36
4.2 在不同的汽泡動力參數組合下，螺旋管沸騰熱傳分析 38
4.3 網格的建立與靈敏度分析 45
4.4 在不同的紊流模式下，螺旋管單相/沸騰熱傳分析 49
4.5 螺旋管在進入沸騰態後，與經驗式的比較 56
4.6 在不同的熱通量與質量流量下，螺旋管沸騰熱傳分析 60
4.7 螺旋管在單相/雙相沸騰的周向熱傳特性分析 62
4.8 在不同的熱通量與質量流量下，螺旋管在單相流完全展開區的周向熱傳特性分析 64
4.8.1 網格靈敏度分析 67
4.8.2 結果 70
4.9 螺旋管在雙相沸騰區的周向熱傳特性分析 74
4.9.1 網格 84
4.9.2 結果 85
4.9.3 壁面沸騰模式的驗證分析總結 95
4.10 在考量壁面熱傳導效應下， 螺旋管在雙相沸騰區的周向熱傳特性分析 96
4.10.1 網格 98
4.10.2 結果 99
第五章 結論與未來工作 111
5.1 結論 111
5.2 未來工作 113
參考文獻 114


 

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