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系統識別號 U0026-2408202014230800
論文名稱(中文) 同心雙圓管外環/內管流道內分流奈米相變化乳液/氧化鋁奈米流體之強制對流熱傳遞特性研究
論文名稱(英文) Forced convection heat transfer characteristics of concurrent flows of a Nano-PCM emulsion/Al2O3 nanofluid through outer annulus/inner tube of a concentric double-tube duct
校院名稱 成功大學
系所名稱(中) 機械工程學系
系所名稱(英) Department of Mechanical Engineering
學年度 108
學期 2
出版年 109
研究生(中文) 黃再平
研究生(英文) Zai-Ping Huang
學號 N16071045
學位類別 碩士
語文別 中文
論文頁數 156頁
口試委員 口試委員-謝曉星
口試委員-楊天祥
口試委員-賴啟銘
指導教授-何清政
口試委員-溫昌達
中文關鍵字 同心雙圓管  奈米乳液  相變化材料  層流強制對流 
英文關鍵字 Concentric double tube  Nano-PCM emulsion  Phase change material  Laminar forced convection  Alumina nanofluid 
學科別分類
中文摘要 本文以實驗及模擬方式在同心雙圓管下進行,探討流體在等熱通量中同心雙圓管內層流之強制對流中的熱傳遞特性與效益。先調製以超純水為基底與純20烷製成奈米乳液在不同濃度下並測量其熱性質,再調製以超純水為基底與氧化鋁奈米顆粒製成奈米流體並測量其熱性質,將外環流體以奈米乳液流動而內環流體以奈米流體流動,探討奈米乳液、奈米流體取代純水之效益。
實驗外管使用無氧紅銅管,內管使用不銹鋼管,外管外徑為6mm,外管內徑為5.4mm,長度為1250mm,而內管外經為4.6mm,內管內徑為4.2mm,加熱段長度為700mm。使用鎳鉻電阻線緊密纏繞加熱段外管壁,利用電源供應器使加熱段達等熱通量條件。
實驗中所設定的條件:加熱功率=70w、110w、150w與流量比 =0.17、0.30、0.45、0.70、1.0、1.6、2.38、4.00,和雷諾數Re,ST=500、1000、1500下之固定總流量,奈米乳液重量濃度4.88%、9.38%,奈米流體體積濃度0.5%。
實驗結果表明:平均熱傳增益在總流量277.49(cm3/min)流量比為0.45熱功率為110W時,內管純水而外環奈米乳液4.88%有22%增益、9.38%有29%增益,而外環奈米乳液4.88%內管奈米流體0.5%有24.4%增益。
數值模擬結果:純水在總流量181.84(cm3/min)流量比0.17、0.45、1.00、2.38下呈現熱阻關係,隨流量比越大同心雙圓管總熱阻越小,反之,流量比越小熱阻越大。
英文摘要 In this paper, experiments and simulations are carried out under concentric double circular tubes to explore the heat transfer characteristics and benefits of fluid in forced convection of laminar flow in concentric double circular tubes with equal heat flux. First, prepare a nanoemulsion with ultra-pure water as the base with pure n-eicosane at different concentrations and measure its thermal properties. Then, prepare a nanofluid with ultra-pure water as the base with alumina nanoparticles and measure its thermal properties. The outer ring fluid is flowed by nanoemulsion and the inner ring fluid is flowed by the nanofluid, to discuss the benefits of nanoemulsion and nanofluid instead of pure water.

The outer tube of the experiment is an oxygen-free copper tube, and the inner tube is a stainless steel tube. The outer diameter of the outer tube is 6mm, the inner diameter of the tube is 5.4mm, and the length is 1250mm. The outer tube of the inner wall is 4.6mm and the inner tube of the inner wall is 4.2mm. The length of the heating section is 700mm. Use nickel-chromium resistance wire to tightly wrap the outer tube wall of the heating section, and use the power supply to make the heating section reach equal heat flux conditions.

The conditions set in the experiment: heating power = 70w, 110w, 150w and flow rate ratio = 0.17, 0.30, 0.45, 0.70, 1.0, 1.6, 2.38, 4.00, and total flow under Reynolds number =500、1000、1500, Nano emulsion weight concentration 4.88%、9.38% and alumina nanofluid volume concentration 0.5%.

The experimental results show that the average heat transfer efficacy compared with pure water when the total flow rate is 277.49(cm3/min), the flow ratio is 0.45 and the heat power is 110W, the inner tube of pure water and the outer ring of nanoemulsion weight concentration 4.88% have 22% efficacy and weight concentration 9.38% have 29%. The outer ring nanoemulsion 4.88% inner tube nano fluid volume concentration 0.5% has a 24.4% efficacy.

Numerical simulation results: pure water shows a thermal resistance relationship at flow ratios of 0.17, 0.45, 1.00, and 2.38. When the larger the flow ratio, the smaller the total thermal resistance of the concentric double circular tube. On the contrary, the smaller the flow ratio, the greater the thermal resistance.
論文目次 摘要 I
英文摘要 II
致謝 XVII
目錄 XVIII
表目錄 XXI
圖目錄 XXI
符號說明 XXX
第一章 緒論 1
1-1 前言 1
1-2 文獻回顧 2
1-3 研究動機與目標 8
1-4 論文架構 8
第二章 物理模型及數學模式 9
2-1同心雙圓管流道強制對流熱傳遞物理模型 9
2-2同心雙圓管流道強制對流熱傳遞數學模型 10
2-2-1統御方程式 11
2-2-2邊界條件 13
2-2-3無因次變數定義 15
2-2-4無因次統御方程式與邊界條件 17
2-3熱傳遞特性相關物理量定義 21
2-3-1局部熱阻與平均熱阻定義 26
第三章 實驗方法與數據處理 30
3-1實驗設計與模型 30
3-2實驗步驟 35
3-3奈米乳液/流體製備與熱物性量測 37
3-3-1奈米相變化乳液製備方法 37
3-3-2奈米流體製備方法 39
3-3-3奈米乳液/流體熱物理性質量測 39
3-4 純水熱物理性質 49
3-5對流熱傳遞實驗及量測數據處理 50
3-5-1同心雙圓管數據處理 50
3-6不準度分析 61
第四章 同心雙圓管強制對流熱傳遞特性研究 69
4-1同心雙圓管實驗結果 69
4-1-1不同流體下外環內壁無因次溫度分布 69
4-1-2使用奈米相變化/奈米流體替代純水熱傳遞增益評比 89
4-1-3使用奈米相變化/奈米流體替代純水熱散溢性能效益值 108
4-2同心雙圓管數值方法與模擬分析 125
4-2-1模擬網格設計與離散方法 125
4-2-2模擬參數與步驟 126
4-2-3數值模擬網格測試 127
4-2-4數值模擬與實驗比較 128
第五章 同心雙圓管與單圓管熱傳遞增益比較 134
5-1 雙管使用不同流體與單管純水比較之局部熱傳遞增益 134
5-2 雙管使用不同流體與單管純水比較之平均熱傳遞增益 135
第六章 結論與未來工作 152
6-1結論 152
6-2未來方向 153
參考文獻 154
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