臺灣博碩士論文加值系統

微通道內流動沸騰熱傳在熱流科技與電子散熱等方面之應用正受到重視，但仍有許多熱傳上的基本論點尚未被釐清。本研究以實驗方法探討介電流體(HFE-7100)在微通道散熱冷板內之蒸發熱傳特性與壓降現象:即探討熱通量、質通量、蒸氣乾度對於熱傳係數與壓降現象的影響。
本研究觀察在水力直徑480μm及790μm矩形構造的多管式微流道散熱器內，介電液HFE-7100的熱傳和壓降特性。水力直徑480μm在較低質通量100和200kg/m2s，發現在沒有迴流的情況下熱傳係數不會隨著熱通量和乾度變化而改變。不過，在提升熱通量後產生迴流的現象，使熱傳導係數下降，迴流也在總壓降中有重要作用，與水力直徑790μm隨乾度變化不大有不同的結果。如果沒有迴流，高熱通量的壓降超過低熱通量是由於加速度貢獻。不過，迴流的存在可以補償加速壓降的貢獻並且導致忽視熱通量的效應在較高質通量300kg/m2s，熱傳係數實際上獨立於乾度和熱通量，也與水力直徑790μm熱傳係數會隨著熱通量上升不同。

This study examines the heat transfer and pressure drop characteristics of the dielectric fluid HFE-7100 within multiport microchannel heat sink having a square configuration rectangular with a hydraulic diameter of
460μm and790μm. For a lower mass flux of 100 or 200kg/m2s, it is found that the heat transfer coefficients are roughly independent of heat flux and vapor quality provided that no flow reversal occurs. However, with the presence of flow reversal at an elevated heat flux, appreciable drop of heat transfer coefficient is encountered. The flow reversal also plays a significant role in the overall pressure drop and 790μm not change with vapor quality difference Without flow reversal, the pressure drop for higher heat flux always exceeds that of lower heat flux due to acceleration contribution. However, the presence of flow reversal may offset the contribution of acceleration and results in a negligible effect of heat flux. For a higher mass flux like 300kg/m2?s, the heat transfer coefficients are virtually independent of vapor quality and heat flux. 790μm with the heat transfer coefficient will increase with the different heat flux.

摘 要 i
Abstract ii
致謝 iii
目錄 iv
表目錄 vi
符號說明 vii
第一章 簡介 1
1-1 研究動機 1
1-2 文獻回顧 3
1-3 研究目的 6
第二章 實驗系統與方法 7
2-1 工作流體 7
2-2 HFE-7100 除氣裝置 7
2-3 介電流體迴路 8
2-4 預熱段迴路 9
2-5 冷凝器與次冷裝置 10
2-6 量測元件 10
2-6-1 溫度計 10
2-6-2 壓力計及差壓計 10
2-6-3 流量計 11
2-7 實驗儀器 11
2-7-1 電源供應器及加熱片 11
2-7-2 資料擷取系統 11
2-7-3 幫浦 12
2-8 實驗參數 13
2-9 實驗方法及步驟 13
2-9-1 實驗前準備工作 13
2-9-2 熱損實驗量測 13
2-9-3 實驗步驟 14
2-10 實驗穩定判斷及注意事項 14
第三章 理論分析與資料換算 15
3-1 測試段之熱損失之預估 15
3-2 預熱段熱損失之估計 15
3-3 微流道表面溫度之推算 16
3-4兩相流熱傳係數與蒸汽乾度 16
3-5 兩相流動壓降分析 17
3-6 雙相流動沸騰熱傳經驗式 19
第四章 實驗結果與討論 21
4-1 壓降分析 21
4-2 熱傳分析 23
第五章 結論 26
參考文獻 28

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