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研究生: 劉敦仁
論文名稱: 多級式EHD散熱技術之研究
Heat Transfer Technology of Multiple Staged EHD
指導教授: 許文震
口試委員: 王訓中
王啟川
學位類別: 碩士
Master
系所名稱: 工學院 - 動力機械工程學系
Department of Power Mechanical Engineering
論文出版年: 2013
畢業學年度: 101
語文別: 中文
論文頁數: 80
中文關鍵詞: 電液動力學EHD雙級式EHD幫浦電極遮蔽
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  • 本實驗主要是討論利用電液動力學(electrohydrodynamics, EHD)之技術來提升散熱能力。其原理為在一排針狀電極上通高壓電,使電極附近的空氣解離進而產生離子風,以達到增強散熱能力之目的。在本實驗中設計雙級式的EHD幫浦來提升單級式幫浦的平均風量及風速。希望藉由再串接一排針狀電極的方式,跟單級時進行平均風速和風量的比較觀察其提升效果如何。透過實驗結果可知,在單級幫浦時網子的選擇是非常重要的,網子過密和過疏對幫浦平均風速都是不太好的。且在單級幫浦下以在七根電極、間距10mm和接地網為12目線徑0.35時平均風速最大可達1.2487(m/s)。在雙級幫浦時,採用四種不同電極排列和間距的改變來觀察提升的效果。由實驗結果知在間距10mm平均速度和風量方面以七-五雙級>五-七雙級>七-七雙級>五-五雙級,在間距20mm七-五雙級>五-七雙級約等於七-七雙級>五-五雙級,在間距30mm七-五雙級>五-七雙級>七-七雙級約等於五-五雙級,而整體而言是在間距20mm下提升效果最好。較好的電極排列為七-五雙級與五-七電極和前級電極遮蔽效果有關。


    摘要 i 致謝 ii 目錄 iii 圖表目錄 v 第一章 緒論 1 1-1前言 1 1-2文獻回顧 4 1-2-1 EHD現象之文獻回顧 4 1-2-2 EHD散熱應用之文獻回顧 7 1-2-3 EHD濕度影響之文獻回顧 10 1-2-4多級式EHD幫浦文獻回顧 11 第二章 EHD原理簡介 18 2-1 EHD概論 18 2-2 EHD運作原理簡介 18 2-3電暈現象 20 2-3-1離子生成與電暈風 20 2-3-2正電暈下離子的運動行為 21 2-3-3負電暈下離子的運動行為 22 2-3-4粒子間碰撞之行為: 24 第三章 實驗設備及方法 26 3-1實驗設計與量測 26 3-2實驗設備 29 3-2-1熱線校正設備系統 30 3-2-2 EHD串接幫浦量測系統 34 3-3 熱線測速儀簡介[32] 38 3-3-1熱線測速儀基本原理[33] 39 3-3-2熱線探針的校正 40 第四章 實驗數據與討論 42 4-1單級式EHD幫浦 43 4-1-1接地網種類對平均速度的影響 43 4-1-2電極根數對平均速度的影響 47 4-1-3電極對接地網距離對平均速度的影響 49 4-2雙級式EHD幫浦 52 4-2-1前級電極與後級接地網間距離對平均速度及風量的影響 52 4-2-2改變前後級電極根數對平均速度及風量影響 60 4-2-3單級和雙級間平均速度提升效果討論 64 4-2-4雙級和雙級間平均速度提升效果討論 67 4-3能量轉換效率評估 70 4-4散熱效果評估 71 第五章 結論與未來展望 74 5-1結論 74 5-2未來展望 74 參考文獻 76 附錄 80

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