聚二甲基矽氧烷之震盪式熱管研製

淡江大學機構典藏 > 工學院 > 機械與機電工程學系暨研究所 > 學位論文 > Item 987654321/35377

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題名:	聚二甲基矽氧烷之震盪式熱管研製
其他題名:	Fabrication of polydimethylsiloxane pulsating heat pipe
作者:	吳宗祐;Wu, Tsung-yu
貢獻者:	淡江大學機械與機電工程學系碩士班康尚文;Kang, Shung-wen
關鍵詞:	聚二甲基矽氧甲烷;震盪式熱管;翻模;充填率;PDMS;Pulsating Heat Pipes;Turn Over the Mold;Filled Ratio
日期:	2007
上傳時間:	2010-01-11 06:27:28 (UTC+8)
摘要:	本論文是利用聚二甲基矽氧烷(Polydimethylsiloxane, PDMS)為其管路材質，製作出長、寬及流道內徑各為56mm、50mm以及2mm的可視化之震盪式熱管(Pulsating Heat Pipe, PHP)，其中包含熱管製程、真空處理、充填、封裝等，嘗試設計一可依循的製程與原型製作。將測試平台架構完成，並利用甲醇及乙醇為工作流體，在固定充填率(約60％)、不同輸入功率下(3W、4W、5W、6W、7W、8W)測試其效能。並且利用高速攝影機，拍攝流道內工作流體作動之情形，加以分析討論。其實驗結果，以甲醇為工作流體，垂直擺放時，可得最佳效能。在輸入功率3W時，其熱阻值比乙醇為工作流體時少了4.5°C/W。而在輸入功率為4W時，其蒸發端平均溫度低了15°C。從實驗結果也得知，重力對PHP性能的影響，PHP在垂直擺放下比水平擺放時，更容易啟動。在可視化方面，利用高速攝影機來觀察PHP流道內複雜的汽-液柱作動情形，以便得知實際流場之行為模式。可清楚觀察到，PHP隨著不同的輸入功率，工作流體之作動情形及流場型態也隨之改變。從細泡流場轉變為彈狀型流場再變為連續彈狀型流場；並且可清楚觀察到，汽泡在蒸發端成核之情況、汽泡與汽泡之結合及分裂與汽泡之崩潰、消失等。而當PHP在輸入較高之熱通量時，汽-液柱會開始朝一固定方向在流道內作大幅度之循環。 This paper reports on preliminary experimental results by using polydimethylsiloxane (PDMS) to manufacture a visual pulsating heat pipe with length, width and internal diameter are 56mm, 50mm and 2mm respectively. That includes manufacturing process and the vacuuming management for filling and packaging. Try to design a standard process to manufacture the prototype and to complete the test platform structure. Make use of the methanol and ethanol to be the working fluid. According to the fix filled ratio (about 60%) and different heating power (3W, 4W, 5W, 6W, 7W, 8W respectively) to test the thermal performance. By utilizing the high speed video camera, shoot working situation of the working fluid inside the channel will be discussed and analyzed. The experimental shows that when the working fluid is methanol and placed it in vertical orientation could have shown the best efficiency result. When the heating power is 3W, the thermal resistance is less to 4.5ºC/W than the ethanol working fluid. When the heating power is 4W, the average temperature will decrease to 15ºC of the evaporator. In the mean time, the gravity will have the impact on PHP performance, therefore the vertical orientation is easier to work as compared to the horizontal orientation. According to the visual observation, utilize the high speed video camera; observe that working situation of the complex vapor plug and liquid slug inside the channel to study the behavior of flows. It is clear to observe the different heating power of the pulsating heat pipe which changes the working situation and flow type of the working fluid. We can find out that change from minute bubble flow into slug bubble flow and change into continuous slug bubble flow, nucleation of bubble in the evaporator, bubble combination, break, collapsed and vanishes. When PHP is inputting higher heat flux, vapor plug and liquid slug will begin in a regular direction inside the channel to make it circulate with high oscillation amplitude.
顯示於類別:	[機械與機電工程學系暨研究所] 學位論文

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