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作者(中文):蔡東逸
作者(外文):Tsai, Tung-Yi
論文名稱(中文):圓形與正方形陣列結構物對於PDMS微流道內之流場與熱傳分析
論文名稱(外文):Flow Field and Heat Transfer Analysis on PDMS Microchannels with Circular and Square Pin Array
指導教授(中文):黃智永
劉通敏
指導教授(外文):Huang, Chih-Yung
Liou, Tong-Miin
口試委員(中文):劉耀先
田維欣
口試委員(外文):Liu, Yao-Hsien
Tien, Wei-Hsin
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
學號:107033508
出版年(民國):109
畢業學年度:109
語文別:中文
論文頁數:114
中文關鍵詞:微流道熱傳陣列結構物微粒子影像測速法溫度螢光感測塗料
外文關鍵詞:Microchannelheat transferPin ArrayTemperature Sensitive PaintMicro Particle Image Velocimetry
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本研究主要是以實驗方法探討在微流道中加入兩種形狀陣列於各雷諾數下的流場特性與熱傳分析。實驗中利用微粒子影像測速法(micro-PIV)全域性量測速度場並輔以流場可視化(FV)觀測流線上之變化,利用溫度螢光感測塗料(TSP)全域性量測溫度場以探討熱傳現象,加入壓力量測探討綜合性能。此性能則是將壓力及紐索數無因次化,以無因次化參數η來評估在直流道加入陣列後是否能有較好的效益。
本研究採用交錯式陣列置入PDMS微流道,設計形狀分為正方形與圓形,共有6對結構,實驗時雷諾數為20、40、80。本研究利用V向量速度值與尾流區大小探討結構帶來的影響,並在量測液溫與壁溫後利用熱傳分析來互相印證。首先針對雷諾數最大(以80為例)的圓形交錯式陣列速度場及熱傳進行分析位置討論與選擇,挑選在x/pitch = n+0.4為結構後方V向量速度值振幅最大的地方進行後續分析討論。由定量化速度分析結果顯示,在三個雷諾數條件下,正方形的V向量速度值皆大於圓形,因此正方形對於流場擾動現象較明顯,在最後一對結構後方尾流區影響範圍也是正方形大於圓形。由熱傳結果顯示,整體軸向之平均紐索數會隨著雷諾數提高而變大,在結構後方的局部紐索數則是因為受到結構擾動流場的關係而提高。普遍而言,在三個雷諾數條件下,正方形陣列軸向平均紐索數及結構後方局部紐索數皆會高於圓形陣列。因此由速度及熱傳方面互相驗證,正方形陣列對於流場擾動的影響大於圓形陣列,故正方形陣列造成的熱傳效果較佳。
最後使用η值來評估整體熱傳效益,在雷諾數20時加入兩種形狀陣列的η值皆小於1,表示其效益不彰;在雷諾數40以上加入兩種形狀陣列的η值皆大於1,表示其效益優於直流道。雷諾數40時加入圓形陣列效益較佳,其η值為1.096大於正方形(1.082);在雷諾數80時則是加入正方形陣列效益較佳,其η值為1.128大於圓形(1.107)。
This study aims to investigate flow field, heat transfer characteristic, and hydraulic performance of rectangular microchannels with microstructures of staggered circle and square arrays. The microchannel devices were fabricated by MEMS techniques and made of PDMS material. The flow field was measured by Micro Particle Image Velocimetry (μ-PIV) and flow visualization (FV) of Reynolds number (Re) 20, 40, and 80 and the temperature field was measured by Temperature Sensitive Paint (TSP). The hydraulic performance (η) was evaluated by a dimensionless quantity of Nusselt number (Nu) and pressure drop.
For the velocity measurements, it was noticed that V component velocity was affected by microstructures, and the amplitude of V component was used to analyze the influence of the flow field. It was also noted that Nu variation was influenced by the amplitude of V component velocity. The V component velocity and Nu number at x/pitch = n+0.4 was selected for further discussion of flow field and heat transfer variation.
From the velocity profiles of V component, it was noticed that the amplitude of V component and the range of wake region were bigger in microchannel flow with square array than circle array at Re number of 20, 40, and 80. In the heat transfer analysis, averaged stream-wise Nu number increased with increasing Re number, and local Nu number immediately after each structure also increased. Heat transfer enhancement of microchannel flow with staggered square array at Re number of 80 was the highest: the averaged stream-wise Nu number reached up to 5.66 and the local maximum Nu number reached up to 6.3.
A dimensionless quantity η was used to compare hydraulic performance of staggered array to straight microchannel without microstructures. η of microchannel with staggered array increased with increasing Re number. η was smaller than 1 at Re number of 20, but η was higher than 1 at Re number of 40 and 80. In general, hydraulic performance of circle and square array were both worse than smooth channel at Re number of 20. However, hydraulic performance of circle array was better than square array at Re number of 40 and both circle and square array showed better hydraulic performance than straight microchannel. At Re number of 80, hydraulic performance of square array was better than circle array.
摘要 I
Abstract III
誌謝 V
目錄 VI
圖目錄 IX
表目錄 XVI
第1章、 緒論 1
1.1 前言 1
1.2 研究動機 1
1.3 文獻回顧 3
1.3.1 微流體單相熱傳研究 3
1.3.2 微粒子影像測速法(Micro-PIV)發展 11
1.3.3 溫度螢光感測塗料(TSP)發展 15
1.3.4 微陣列鰭片(micro pin-fin)發展 20
1.4 研究目的 31
第2章、 實驗原理 32
2.1 Micro-PIV量測原理 32
2.2 Micro-PIV分析原理 33
2.3 TSP溫度螢光感測塗料原理 34
2.4 微流道單相熱傳分析 36
第3章、 實驗系統及方法 40
3.1 微流道(micro-channel)製程 40
3.2 微型加熱器(micro heater)製作 41
3.3 Micro-PIV速度量測與流場可視化系統 44
3.3.1 Micro-PIV螢光粒子選用 44
3.3.2 Micro-PIV實驗儀器架設 46
3.3.3 流場可視化系統 48
3.4 TSP溫度量測系統 49
3.4.1 TSP量測系統之溫度螢光感測塗料與溶液配製 49
3.4.2 TSP量測系統之實驗架設 51
3.4.3 TSP校正曲線 52
3.4.4 TSP實驗架設之軸向熱傳數 56
3.4.5 TSP實驗架設之熱損 56
3.5 壓力量測系統 58
第4章、 矩形微流道之速度場與溫度場驗證 59
4.1 矩形微直管道速度場驗證 59
4.2 速度場誤差分析 62
4.3 矩形微直管道溫度場驗證 62
4.4 溫度場與紐索數誤差分析 65
4.5 矩形微直管道內壓力量測 67
第5章、 交錯式陣列設計與分析 70
5.1 微流道內之交錯式陣列設計 70
5.2 分析位置之選擇 71
第6章、 不同形狀之交錯式陣列流場分析 78
6.1 雷諾數20之交錯式陣列速度場 78
6.2 雷諾數40之交錯式陣列速度場 82
6.3 雷諾數80之交錯式陣列速度場 86
第7章、 不同形狀之交錯式陣列溫度量測 91
7.1 雷諾數20交錯式陣列溫度場及熱傳分析 91
7.2 雷諾數40交錯式陣列溫度場及熱傳分析 94
7.3 雷諾數80交錯式陣列溫度場及熱傳分析 97
7.4 流場與熱傳之綜合討論 100
第8章、 結論與未來建議工作 105
8.1 結論 105
8.2 未來建議工作 108
參考文獻 109
附錄 113

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