本研究使用溫度感測微分子技術量測單邊定熱通量邊界條件下的PDMS微矩形蛇型彎道之單相、兩相溶液與壁面溫度場分佈以及討論其熱傳特性。研究同時使用Micro-PIV技術量測微矩形流道的單相、雙相速度場分佈，並將速度場結果與溫度場結果相互比較印證，建立微流道兩相熱傳現象的研究與結果討論。
本研究以模擬的方式證實溫度螢光感測微分子所量測的到的溫度T_(m,x)可以取代理論定義上的整體平均溫度T_(b,x)，進而分析流體的熱傳行為。溫度感測微分子量測技術具有高空間解析度優點，可用於討論在低雷諾數下軸向熱傳的影響，在單相熱傳量測實驗中，實驗結果發現不論工作流體為乙醇或是去離子水，於雷諾數11-93的區間其軸向壁面、液體溫度分佈接近微直管道的溫度分佈。根據實驗結果計算單相乙醇熱傳全展Nu值為2.61、平均Nu值2.95，單相去離子水熱傳全展Nu值2.7、平均Nu值3.1。於兩相實驗中，本研究以Micro-PIV技術量測乙醇/空氣所組成的兩相區段流的速度場分佈，成功觀察到其渦旋結構，並在固定液相流量下，發現提高氣相流量可增加流場中液體段的迴旋渦流強度。本研究成功以溫度感測微分子技術以非侵入式的方式量測全域兩相區段流的壁面以及溶液溫度分佈，相較於文獻以紅外線技術量測兩相流外壁面溫度，本研究所使用的光學量測技術能夠直接觀測到流道內壁面以及溶液溫度隨著不同位置往下游發展的溫度分佈情形，並發現液體段溶液溫度因為渦旋結構其溶液溫度有混合的現象，其前段加熱區域的壁面溫度能夠有效的降低，同時溶液溫度則有明顯的溫度上升趨勢。當L_b/W=7.32時，完全發展區域Nu為3.23較單相實驗Nu值2.42高（在相同液相雷諾數〖Re〗_l），而兩相流的平均Nu值相較於單相平均Nu值(相同液相雷諾數〖Re〗_l)增加了30%。在考慮了氣體在流道所佔的比例後，發現平均Nu值相較於單相Nu值成長了200%。本研究於兩相熱傳中的全域溫度量測以及速度場量測可以提供相關散熱應用作為參考，整體熱傳分析誤差約為8%。

The study aims to investigate the characteristics of heat transfer with segmented flow in PDMS microchannel under one side constant wall heat flux thermal boundary condition using temperature sensitive paint (TSP) and Micro Particle Image Velocimetry (Micro-PIV). Detailed Temperature distributions in fluid and wall surface have been acquired by temperature sensitive luminescent sensors in the form of temperature sensitive solution and temperature sensitive paint. Velocity profiles in the microchannel devices with single phase flow and two phase flow (segmented flow) have also been measured by Micro PIV.
Additionally, ANSYS simulation has been performed to examine the bulk mean temperature profiles acquired by TSP technique using luminescent intensity measurements. The results show that the depth-averaged temperature profiles acquired by TSP technique agree with the bulk-mean temperature calculated from simulation. TSP technique has the advantages of high spatial resolution (200μm/pixel) and global fluid temperature measurements, and heat flux variation from channel entrance can be calculated and the effect from axial heat conduction has been observed.In single phase heat transfer measurement, the fluid and surface temperature distributions in the microchannel device are close to the temperature distribution in straight microchannel at Re number ranging from 11 to 93. The local Nu number in fully developed region and averaged Nu number of ethanol is 2.61 and 2.95. The local Nu number in fully developed region and averaged Nu number of DI water is 2.7 and 3.1
Micro-PIV technique has also been performed to provide the velocity distribution in two phase segmented flow. The structure of flow circulation in ethanol/air two phase flow was identified. The vortex structure in liquid segment can be enhanced by increasing gas phase flow rate while maintaining liquid phase flow rate. Compared with heat transfer from single phase flow, the two phase segmented flow helps the flow mixing in the liquid segment and the fluid temperature rises more quickly while the wall surface temperature decreases faster in the beginning of heating. When L_b/W_m=7.32,the Nu number of 3.23 has been calculated in the two phase segmented flow which is higher than 2.42 measured from single phase (liquid) flow at the same Reynolds number (〖Re〗_L) in the fully developed region. The averaged Nu number of two phase segmented flow shows about 30% increases compared to the Nu Number measured from single phase flow.Considered the effect with void fraction of gas, the veraged Nu number of two phase segmented flow shows about 200% increases compared to the Nu Number measured from single phase flow

摘要 I
ABSTRACT III
誌謝 V
目錄 VI
圖目錄 X
表目錄 XVIII
符號說明 XX
第一章、 序論 1
1.1 研究動機 1
1.2 文獻回顧 2
1.2.1 Micro-PIV發展及回顧 2
1.2.2 氣泡區段流(segmented flow)回顧 7
1.2.3 微流道兩相區段流速度場研究回顧 9
1.2.4 微流道單相熱傳回顧 13
1.2.5 微流道兩相熱傳回顧 19
1.2.6 TSP螢光溫度感測塗料發展 22
1.3 研究目的 24
1.4 論文架構 24
第二章、 實驗原理 26
2.1 Micro -PIV量測原理 26
2.2 螢光溫度感測實驗原理 27
2.3 微流道單相熱傳分析原理 30
2.3.1 熱傳特性分析原理 30
2.4 兩相熱傳分析原理 38
第三章、 實驗方法 39
3.1 微流道製作 39
3.2 Micro-PIV系統介紹 42
3.2.1 Micro-PIV 實驗儀器架設 42
3.2.2 流量控制/訊號產生器設定 44
3.2.3 景深與解析度計算 47
3.3 螢光溫度感測塗料研究 49
3.3.1 螢光溫度感測溶液/塗料調配測試 49
3.3.2 溫度校正實驗儀器架設 54
3.3.3 螢光溫度感測溶液校正曲線 56
3.3.4 螢光溫度感測塗料校正曲線 61
3.3.5 校正公式 64
3.4 加熱裝置設置與熱損控制 67
第四章、 單相流場與熱傳實驗量測 76
4.1 單相速度場量測結果 76
4.1.1 彎管前速度完全發展區(Section 1) 77
4.1.2 彎管速度場(section 2) 86
4.1.3 彎管後速度場(Section 3) 91
4.2 單相溫度場量測結果 93
4.2.1 校正方式 93
4.2.2 熱損計算 97
4.2.3 工作流體去離子水溶液溫度場量測 99
4.2.4 工作流體去離子水壁面溫度場量測 103
4.2.5 工作流體去離子水熱傳特性探討 105
4.2.6 工作流體乙醇溶液溫度場量測 110
4.2.7 工作流體乙醇壁面溫度場量測 113
4.2.8 工作流體乙醇熱傳特性探討 115
第五章、 兩相流場與熱傳研究 120
5.1 兩相速度場量測結果 121
5.2 兩相溫度場量測 126
5.2.1 兩相溶液軸向溫度場量測 127
5.2.2 兩相軸向壁面溫度場量測 130
5.2.3 兩相熱傳特性探討 132
第六章、 影像處理與誤差分析 137
6.1 影像處理 137
6.1.1 PIV影像處理 137
6.1.2 溫度影像校正 141
6.1.3 兩相流影像處理 148
6.2 誤差分析 153
第七章、 結論與未來工作建議 158
7.1 結論 158
7.2 未來工作建議 161
參考文獻 162
附錄一 169
附錄二 170
附錄三 173
附錄四 174
Vita 175

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