以EHD技術增強熱傳之研究

Heat Transfer Enhanced by EHD Technology

謝維哲

電液動力學 ； 電暈放電 ； 熱對流係數增強 ； electrohydrodynamics ； corona wind ； enhanced convection

清華大學動力機械工程學系學位論文

2008年

碩士

許文震

繁體中文

本研究主要是探討使用無動件的EHD (electrohydrodynamics) 技術來改善自然對流下的散熱能力，將電極放置在鰭片外，外加直流高壓電場，施加電壓0?18kV的實驗範圍內，探討電極形狀如何設計才是一根良好的電極，在本實驗中，電極形狀為尖形時，電荷密度集中導致庫侖力較大，產生平均風速高達1.4m/s，熱對流係數可提升為自然對流係數的2.6倍，同時初始電壓降低許多，火花電壓也隨之下降。若電極形狀為圓形時，熱傳增強效果均不如平面電極。另外也探討溼度對熱傳性能的影響，在低相對溼度為45%的情狀之下，熱對流係數可提升為自然對流係數的3.2倍，其中溼度對負電暈影響比正電暈大，本研究也探討電極極性、電極與鳍片之間的距離、電極直徑、電極數目、排列等等因素對EHD散熱效果的影響。也探討初始電壓、火花電壓之間的操縱範圍電壓的影響因素。實驗結果指出，在負電暈、電極距離大、電極直徑小、電極形狀為尖形、電極數目多、低溼度的情狀下對於熱傳效果更佳。

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