平板震盪型熱管之可視化觀測及性能研究; The Visualization of Flat Plate Pulsating Heat Pipe

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Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/25526

Title:	平板震盪型熱管之可視化觀測及性能研究;The Visualization of Flat Plate Pulsating Heat Pipe
Authors:	彭賢凱;Hsien-Kai Peng
Contributors:	機械工程研究所
Keywords:	震盪型熱管;可視化;Visualization;Pulsating Heat Pipe;Flat Plate
Date:	2009-11-13
Issue Date:	2010-06-10 16:55:08 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	本研究將震盪型熱管的流道利用濕蝕刻加工於銅板上，並設計兩種不同迴路型式的流道，在固定填充率50%的條件下，測試不同傾斜角度0°~90°對熱傳性能的影響，並利用高速攝影機觀測流道內汽泡震盪的情形，希望藉由可視化觀測得知不同操作條件對平板震盪型熱管的影響。在可視化觀測及熱阻分析下，可得單一迴路震盪型熱管最佳操作角度為90°，且傾斜角度在 30°~90°時皆可產生震盪現象。其熱阻隨傾斜角度加大而降低，最大降幅發生在傾斜角度90°，加熱量45W時，熱阻較流體未發生震盪時降低44%。由於雙向迴路的流道設計，隨著加熱量增加，流體開始震盪，下半迴路遭蒸氣排開的區域也增加，熱阻僅微幅下降。實驗證實震盪型熱管內流體震盪，能有效增加熱傳，但在操作角度上仍有其極限。 This article is trying to etching manufactured pulsating heat pipes on copper plate, and design two kind of loop type channel, In this article, experiment three filling ratio 50 %, and different incline, which were 0°、30°、60° and 90°, also record vapor motion in the channel by high speed camera，and want to know different operate conditions effect to flat plate pulsating heat pipes by visualization observe. By visualization observe and thermal resistance analysis, it is found out that, with a filling ratio 50 % and incline angle 90° have optimal performance yields a thermal resistance, and the phenomenon of oscillating can observe from30°~90°, when heating rate at 45W, thermal resistance decrease 44% than heating rate at 15W. In the double loop pulsating heat pipes, thermal resistance change is unobvious with heat input. In this article we found that the flow oscillating can enhance heat transfer, but there is a critical in low incline angle.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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