具渦流產生器之散熱鰭片實驗研究

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姓名

吳信昌(Hsin-Chang Wu) 查詢紙本館藏

畢業系所

機械工程學系

論文名稱

具渦流產生器之散熱鰭片實驗研究
(A study of cooling fin with vortex generators)

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摘要(中)

本實驗主要將渦流產生器應用於平板散熱鰭片上。利用渦流產生器所
產生的渦流破壞邊界層，增加鰭片散熱效果。使用三角形翼對為設計基礎，設計出不同排列方式。並且為了得知鰭片間距對具渦流產生器散熱鰭片的影響，分別設計1.38mm 以及1.85mm 兩種不同鰭片間距。各式具渦流產生器散熱鰭片性能，經由實驗測試並討論。在相同流量情況下，渦流產生器的數目愈多，阻力越多，壓降就越大。
當鰭片間距為1.85mm 而且高流速高加熱量情況下，兩列渦流產生器散熱鰭片，因為上面空氣帶動中間流體流動，而產生較強渦流，有較佳的熱傳性能。空氣流速為5m/s 時，渦流產生器都能有效產生渦流，使鰭片整體熱傳係數增加。鰭片間距為1.85mm 三排渦流產生器在低流速時，會有比三列渦流產生器還低的熱阻。但是在高流速時，三列渦流產生器還是有較低的熱阻值。本文藉由實驗得知會影響具渦流產生器散熱鰭片的參數，可以根據應用情況的不同，選擇不同形式之具渦流產生器散熱鰭片。

摘要(英)

This study is trying to develop a new kind fin, which were used the theory of vortex generators. Because the longitudinal vortices can destroy boundary layer and increase heat transfer by vortex. Experiment use with triangular winglet to for the design basis, design different ways of arranging. In order to understand the influence by the fin pitch, there are two kinds of fin pitch, which wide were 1.38 mm and 1.85 mm. The heat transfer characteristics of vortex generators were investigated experimentally.
In the same flow rate, the number of vortex generators is more, the more obstruction is, and pressure drop is the greater. For fin pitch 1.85mm and high velocity of flow and high situation of heating, two row vortex generators is
better heat performance. Because the air above drives the middle fluid to flow, it can produce stronger vortex. When the velocity of flow of air is 5m/s, vortex generators can produce vortex effectively, and increase heat transfer coefficient. Fin pitch 1.85mm, three line vortex generators is lower thermal resistance than three row vortex generators in low velocity of flow. But in the high velocity of flow, three row vortex generators have lower thermal resistance value. In this article, some parameters which will influence the vortex generators were understood by experiment, we can choose the different types of vortex
generators by judging the way of application.

關鍵字(中)

★ 渦流產生器
★ 平板
★ 三角形翼對

關鍵字(英)

★ triangular winglet
★ plate
★ vortex generators

論文目次

摘要 i
abstract ii
目錄 iii
表目錄 v
圖目錄 vi
符號說明 viii
第一章、前言 1
1.1 研究動機與背景 1
1.2 研究目的 1
第二章、文獻回顧 5
2.1 幾何形狀 5
2.2 攻角、傾角 6
2.3 排列方式與數量 7
2.4 可視化觀測 8
2.5 總結 9
第三章、實驗方法 17
3.1 渦流產生器設計 17
3.1.1 幾何尺寸 17
3.1.2 渦流產生器排列方式 18
3.1.3 渦流產生器數目 18
3.2 具渦流產生器散熱鰭片製作 19
3.3 實驗系統 19
3.3.1 測試段 19
3.3.2 風洞測試系統 20
3.3.3 模擬加壓平台 20
3.4 實驗量測儀器與設備 21
3.4.1 溫度量測 21
3.4.2 差壓測量 21
3.4.3 流量測量 22
3.4.4 資料擷取系統 22
3.5 實驗步驟 23
3.6 數據換算 23
3.6.1 加熱瓦數 23
3.6.2 熱傳係數 23
3.6.3 熱阻換算 25
3.6.4 泵動力 25
第四章、實驗結果與討論 36
4.1 具渦流產生器散熱鰭片之壓降特性 36
4.2 具渦流產生器散熱鰭片之熱傳特性 37
4.2.1 具渦流產生器散熱鰭片之熱對流係數 37
4.2.2 具渦流產生器散熱鰭片之Nu 39
4.2.3 具渦流產生器散熱鰭片之熱阻 41
4.3 具渦流產生器散熱鰭片之熱傳性能比較 42
第五章、結論 66
參考文獻 67
附錄、實驗誤差分析 70

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指導教授

楊建裕(Chien-Yuh Yang)

審核日期

2008-7-24

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