不同流道型式之蒸發熱交換器的熱傳性能研究

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姓名

李至誠(Chih-Cheng Lee) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

不同流道型式之蒸發熱交換器的熱傳性能研究

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摘要(中)

本研究設計直線流道型、漸擴型以及山型紋之兩相蒸發熱交換器，比
較各型式之熱傳性能，並透過可視化觀察分析流動及熱傳之關係。直線
流道型尺寸共三種: 1. 鰭片高度及間距分別為2、1 mm，2. 鰭片高度及
間距分別為2、2 mm，3. 鰭片高度及間距分別為5、1 mm。漸擴型之流
道設計為鰭片間距1 mm，鰭片高度2 mm 沿流動方向縮減至1 mm 形成
傾斜鰭片。山型紋型式之鰭片間距及高度分別為1、2 mm，傾斜角度為
30度。
鰭片高度為5 mm 之直線流道型熱交換器具有最高之熱傳量，且飽和
溫差最低，熱傳性能最好。其原因為流道內之流動情形以波浪流為主，
流道表面仍有液體補充，使表面溫度較低。而鰭片高度為2 mm 之直線
型、漸擴型流道，流道內以柱狀流為主，汽體佔據流道亦發生局部乾涸
現象使飽和溫差較大。傾斜鰭片之設計使汽泡團聚於流道上方，並無法
有效排除汽泡，流道內以汽體為主熱傳性能低。山型紋之流道於實驗中
未發生燒乾之現象，但無法從可視化觀察到液體團聚於流道之間，且飽
和溫差大。
鰭片高度5 mm 之直線流道具有最低熱阻為0.067 °C/W，相較於其他
型式熱傳量高，且不易乾涸，為本研究設計之最佳型式。

摘要(英)

In this study, we designed two-phase evaporative heat exchangers with: straight fin type, expansion type and chevron, and compared the heat transfer performance of each type. There are three geometry of straight fin type: 1. Fin height 2 mm with fin spacing 1 mm, 2. Fin height2 mm with fin spacing 2 mm, 3. Fin height 5 mm with fin spacing 1 mm. The fin space of the expansion type is 1 mm, and fin height reduced from 2 mm to 1 mm. The space and height of the chevron are 1, 2 mm and the inclination angle is 30 °.
The straight fin type with the fin height of 5 mm has the highest heat transfer rate, and the wall superheat temperature is the lowest, which means that the heat transfer performance is the best. The flow pattern inside the channel are wavy flow, which keep the channel surface wetted. So that the surface temperature become low. When fin height is 2 mm, the flow pattern become slug flow by small hydraulic diameter. Which cause the channel surface become partial dry out easier.
The expansion designed allows the bubble to cover the channel, which let vapor stock in the channel. The chevron does not cause dry out in the experiment, but it can’t be observed the liquid between the flow channel from the visualization.
The straight fin type with a fin height of 5 mm has a minimum thermal resistance of 0.067 °C W. Heat transfer rate is higher than other types and the flow pattern inside the channel is not easy to dry out, so that it is the best type in this study.

關鍵字(中)

★ 兩相蒸發器
★ 直線流道
★ 漸擴型
★ 山型紋
★ 可視畫觀察

關鍵字(英)

論文目次

摘要......................................................i
Abstract.................................................ii
目錄....................................................iii
圖目錄..................................................vi
表目錄...................................................x
符號說明................................................xii

第一章前言................................................1
1.1研究背景與動機..................................1
1.2研究目的........................................8
第二章兩相蒸發熱交換器文獻回顧..............................9
2.1噴流及噴霧冷卻技術之熱傳性能......................9
2.2多孔蕊材熱交換器之熱傳性能......................15
2.3兩相蒸發微流道熱交換器之熱傳性能.................17
2.3.1微流道之兩相蒸發熱傳..................18
2.4蒸發熱交換器類型之熱傳性能比較...................22
2.5微流道熱交換器內流動現象........................24
2.5.1微流道熱交換器內流動沸騰現象之穩定性改善......28
2.5.2微流道內之局部乾涸改善................35
2.6總結..........................................37
第三章研究方法...........................................38
3.1兩相蒸發器之流道設計............................38
3.1.1直線流道設計.........................38
3.1.2傾斜鰭片漸擴流道設計..........................48
3.1.3山型紋流道設計...............................48
3.1.4 熱交換器組合................................52
3.2實驗系統.......................................52
3.2.1加熱系統.............................54
3.2.2實驗量測儀器與設備....................57
3.2.2.1溫度量測...................57
3.2.2.2流量量測...................57
3.2.2.3差壓量測...................57
3.2.3資料擷取系統.........................58
3.3 實驗步驟......................................60
3.4 實驗數據換算..................................61
3.4.1加熱瓦數.............................61
3.4.2質量流率.....................................61
3.4.3乾度........................................62
3.4.4熱傳係數.....................................62
3.4.5熱阻值.......................................63
第四章實驗結果與討論......................................64
4.1熱傳性能之實驗結果..............................64
4.1.1單相能量平衡實驗......................64
4.1.2直線流道型熱交換器之熱傳性能...........66
4.1.3傾斜鰭片型熱交換器之熱傳性能...........72
4.1.4山型紋型熱交換器之熱傳性能............76
4.2蒸發熱交換器之壓降性能..........................80
4.3可視化結果與熱傳性能之關係......................82
4.3.1直線型流道可視化結果與熱傳性能之關係...82
4.3.2傾斜鰭片型流道可視化結果與熱傳性能之關係......86
4.3.3山型紋流道可視化結果與熱傳性能之關係......88
4.4蒸發熱交換器之性能比較..........................90
第五章結論...............................................91
參考文獻..................................................92
附錄(一)、實驗誤差分析....................................96

參考文獻

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指導教授

楊建裕

審核日期

2017-8-21

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