電滲泵之焦耳熱效應分析

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姓名

劉政廷(Jheng-ting Liou) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

電滲泵之焦耳熱效應分析
(Joule Heating Effects of Electroosmotic Pump)

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摘要(中)

電滲泵目前在微流體裝置與微電子冷卻方面的應用漸增，對於其傳輸液體表現與溫度變化特性的探討將有助於提升泵的性能。本文以商用的燒結矽片作為驅動流體的多孔介質製作電滲泵，它依據電雙層(electrical double layer)效應驅動流體。本文使用不同濃度(0.5-4 mM)的硼酸鹽溶液、去離子水與氯化鉀(1 mM)溶液為工作流體並利用不同外加電壓(50-150 V)形成電場。溫度量測使用熱電偶(thermocouple)量測電滲泵出口端的溫度變化。實驗顯示當離子濃度提升與外加電壓的增強都會使得焦耳熱效應(Joule heating effect)更加明顯。
鑑於電滲泵作動期間因為水溶液的電解反應在正負極端分別釋出氧氣泡與氫氣泡，本文藉由二層的質子交換膜管(Nafion tubing)套在白金電極上，來降低氣泡對流體連續傳輸的影響。經由此種改善方式，電滲泵可連續作動8小時且流率相當穩定。本文也以自製的燒結矽片作為多孔介質測試其泵的性能，結果顯示自製燒結矽的泵性能與商用的燒結矽的泵性能相當。

摘要(英)

The electroosmotic pump (EOP) has been used in the microfluidic devices and in the micro-electronics cooling recently. To investigate the behavior of the transporting liquid and its temperature variation can enhance the performance of the EOP. In this study, the EOP is made from a commercial porous sintered silica frit to transport liquid, which utilizes the electric double layer effect as driving force. Three types of working fluid are tested: including the borate solution with various ranges of concentrations (0.5-4 mM), the deionized water and the potassium chloride solution (1 mM). Moderate range of voltages (50-150 V) was applied for generating electric field inside the pump. The thermocouple is used to measure the temperature variation of the outlet of the EOP. Experimental result reveals that the increases of the ionic concentration and the applied voltage will amplify the Joule heating effect.
Due to the electrolysis reaction on the electrode, the hydrogen and oxygen bubbles will be generated at the anode and cathode, respectively. In order to reduce the bubbles, this study sheathes the platinum wire electrode with two layers of Nafion ion exchange membrane tubes. With this modification this EOP demonstrates continuously operate for eight hours with a stable flow rate. This study also fabricate a frit with self-made the porous sintered silica; its result reveals that the performance of self-made porous frit was comparable to that of the commercial frit.

關鍵字(中)

★ 焦耳熱效應
★ 質子交換膜管
★ 電滲流
★ 電滲泵

關鍵字(英)

★ Nafion tubing
★ Joule heating effect
★ Electroosmotic pump
★ Electroosmotic flow

論文目次

中文摘要 I
英文摘要 II
致謝 III
目錄 IV
圖目錄 VI
表目錄 X
符號說明 XI
第一章緒論 1
1.1 研究動機 1
1.2 文獻回顧 2
1.2.1填充式電滲泵 2
1.2.2多孔矽片電滲泵 3
1.2.3交流式電滲泵 4
1.2.4離子交換膜與氣泡重組器 5
1.2.5焦耳熱效應 6
1.3 研究目的 7
1.4 論文架構 7
第二章電滲泵作動原理與焦耳熱效應 9
2.1 基本電滲流理論 9
2.1.1電滲流解析解背景 10
2.1.2泵的有效電壓 12
2.1.3孔隙率與扭曲率 13
2.1.4介面電位 13
2.1.5電雙層特徵厚度 15
2.2 焦耳熱效應 16
第三章電滲泵設計製作 17
3.1 電滲泵製作 17
3.2 實驗設備 19
3.3 實驗材料 19
3.3.1溶液配置 19
3.3.2多孔介質 20
3.3.3 質子交換膜管 21
3.3.4電極 22
3.4多孔介質燒結製程 22
3.5 實驗方法與步驟 23
3.6 實驗誤差 24
第四章結果與討論 26
4.1 溫度 26
4.1.1 不同濃度的溫度變化 26
4.1.2 定電壓下的長時間溫度變化 32
4.1.3 不同溶液的溫度變化 35
4.1.4 不同電極的溫度與流率變化 37
4.1.5 加裝質子交換膜後的流率暫態變化 40
4.2 自製燒結矽與ROBU燒結矽比較 43
4.2.1 流率 43
4.2.2 壓力 45
4.2.3 效率 46
4.3 實驗重現性與長時間作動下的穩定性 49
第五章結論與建議 53
5.1 結論 53
5.2 未來改進方向 54
參考文獻 55

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指導教授

吳俊諆(Jiunn-Chi Wu)

審核日期

2008-7-18

推文