微多孔表面漸擴微流道蒸發器性能研究

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姓名

張益銓(I-Chuan Chang) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

微多孔表面漸擴微流道蒸發器性能研究

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摘要(中)

為了解決未來電子元件的高發熱量，本研究將微多孔表面應用到雙通漸擴微流道蒸發器上，來得到高性能的蒸發器。並與其他種蒸發器作比較，包含微多孔表面的雙通直線與單通直線微流道蒸發器，以及平滑表面的單通直線微流道蒸發器。微多孔表面由平均粉末大小16 μm的鋁粉膠黏堆疊於流道表面上平均厚度約為 50 μm。
雙通漸擴微流道蒸發器中，相較於平滑表面，微多孔表面因為增加成核孔洞的密度，增強成核沸騰，熱傳性能較高，但因為較多的汽泡生成，流道容易堵住，使壓降一併上升，在流量100與187 ml/min，燒乾會發生在較低的加熱通率。微多孔表面能對其熱傳效果提升16% ~ 54%，同時壓降亦增加30% ~ 40%。
在雙通流道形式中，相較於直線流道漸擴流道因為第一通的尺寸較小，汽泡更易堵住，造成微多孔表面的漸擴流道性能比直線差。
另外將雙通與單通作比較，單通直線流道因為長度比較短所以汽泡
較不容易堵住，使性能優於雙通的。
實際應用上，若欲用微多孔表面作增強，則可直接施加於單通直線流道上。若管路位置受限，須將入出口設置於同一側，可考慮使用多孔表面的雙通直線流道。

摘要(英)

This study applies microporous surface on the two-pass divergent microchannel evaporator to obtain a high performance evaporator for solving high heat dissipation rate electronic devices in near future. The result will be compared with other evaporators, which includes single-pass and two-pass straight microchannel evaporator with microporous surface and single-pass straight microchannel evaporator with plain surface, developed by our lab. The 16 μm average size of aluminum particle is used to make the microporous surface, the average thickness is about 50 μm.
Microporous surface increases the nucleation site density, which enhances nucleate boiling and more bubbles are nucleated. While huge amount of bubble will block the channel easier, which causes the higher pressure drop and performance start decreasing at lower heat flux rate. For two-pass divergent microchannel evaporator, the heat transfer coefficient is increased 16% ~ 54% and the pressure drop is increased 30% ~ 40% when microporous surface is applied.
Comparison in two-pass channel shows that the heat transfer performance of divergent channel is worse than straight one due to the smaller size of first pass channel which will make the blockage of bubble easier. While comparing two-pass channel to single pass one, the latter one shows the better performance because of the shorter channel length.
In practice, apply microporous on single pass straight channel will yield the best performance compared to two-pass divergent and straight channel. Yet, if the inlet and outlet port are constrained to the same side, then two-pass straight channel with microporous surface will be a choice.

關鍵字(中)

★ 微多孔表面、
★ 微流道蒸發器
★ 漸擴微流道

關鍵字(英)

★ microporous surface
★ divergent microchannel
★ microchannel evaporator

論文目次

摘要 i
Abstract ii
目錄 iv
圖目錄 vii
表目錄 xi
符號說明 xii
第一章、前言 1
1.1 研究背景 1
1.1.1 回流現象 3
1.1.2 回流現象改善方法 6
1.1.2 沸騰熱傳增強方法 13
1.2 研究目的 14
第二章、文獻回顧 15
2.1 漸擴微流道蒸發器 15
2.2 微多孔表面沸騰增強 28
2.3 總結 37
第三章、研究方法 38
3.1 微多孔表面之製作 38
3.1.1 微多孔層厚度設定 43
3.1.2 噴塗參數 43
3.1.3 製作步驟 44
3.1.4 多孔層厚度測量與表面特徵 46
3.2 測試段組合 50
3.3 實驗系統及設備 52
3.3.1 加熱系統 53
3.3.2 實驗量測儀器與設備 57
3.3.3 資料擷取系統 58
3.4 實驗條件與步驟 59
3.5 實驗數據換算 60
3.5.1 系統飽和溫度 60
3.5.2 測試段加熱率 60
3.5.3 質量流率 62
3.5.4 出口乾度 62
3.5.5 測試段熱傳係數 63
3.5.6 測試段熱阻值 63
3.5.7 測試段壓降 63
3.5.7 泵動力 64
第四章、結果與討論 67
4-1 雙通形式微多孔表面蒸發器性能測試結果 67
4-1-1 熱傳測試結果 67
4-1-2 壓降測試結果 74
4-2 不同微流道蒸發器比較 80
4-2-1 多孔表面雙通形式蒸發器之比較 85
4-2-2 雙通與單通形式流道比較 85
4-2-3 各蒸發器比較 87
第五章、結論 95
參考文獻 96
附錄A、多孔層量測結果 101
附錄B、孔洞判別方法 103
附錄C、實驗誤差分析 111
附錄D、熱邊界層厚度估算 116

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指導教授

楊建裕(Chien-Yuh Yang)

審核日期

2024-1-31

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