以EHD技術增加LED散熱效率之研究｜國立清華大學博碩士論文庫

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研究生：	黃政德 Cheng-Te Huang
論文名稱：	以EHD技術增加LED散熱效率之研究 Investigation of LED Heat Transfer Enhancement by EHD Technology
指導教授：	許文震 Wen-Jenn Sheu
口試委員:
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：	2005
畢業學年度：	93
語文別：	中文
論文頁數：	123
中文關鍵詞：	電液動力學、電暈氣流、增強對流
外文關鍵詞：	electrohydrodynamics, corona wind, enhanced convection
相關次數：	點閱：2 下載：0
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白光LED是一種節約能源的環保照明光源，比起傳統照明光源具有省電及壽命長等優點，但使用在室內照明，因為亮度增加使得LED的發熱功率逐漸升高，傳統被動式散熱法如自然對流已無法適用於高亮度LED，因此散熱問題尚待解決。本文以LED散熱為出發點，使用主動式散熱法，利用EHD技術所產生的電暈氣流，來增強散熱鰭片的對流效果，提高熱傳能力。在本文中EHD電極型式為平行線狀電極，在各種不同條件下外加直流高壓電場來觀察其熱傳效果。實驗結果顯示，在直流電壓1 ~ 16 kV的實驗範圍內，對流係數可提升為自然對流時的1.6至3倍。另外，熱傳效果的改善幅度與供給的電壓強度成正比，與加熱面的發熱量成反比。而電場極性也會影響EHD的性能，負電場所提升的電流比正電場還要高，熱傳效果約比正電場高6 %。以本文的結果來看，消耗功率甚小的EHD確實對於熱傳能力有顯著的改善，雖比不上風扇散熱能力，但在無法使用動件的電子散熱系統中，已能夠發揮不錯的冷卻效果。

The technology of Light Emitting Diodes (LEDs) has rapidly developed in recent years from indicators to illumination applications. With the features of long-term reliability, environmental friendliness and low power consumption, the white light LED is viewed as a promising alternative for future lighting products. Nevertheless, the rate of heat generation increases with the illumination intensity. This issue will become a challenge for thermal engineers to design the indoor LED illumination. Conventionally a passive cooling method like natural convection from heat sinks is no longer adequate for today’s high brightness of LEDs. To solve the thermal problems of LED, the electrohydrodynamics (EHD) technique is utilized to enhance the heat transfer from the heat sinks in the present study. The electric field is generated by parallel wire electrodes with different arrangements charged with DC high voltage. It is found that the heat transfer coefficients under electric fields are greater than those under natural convection by 1.6 ~ 3 times in the test range of 1 ~ 16 kV. Besides, the enhancement of heat transfer increases with the supplied voltage but decreases with raising the Rayleigh number. In addition to the supplied voltage, the electrode polarity also influences the performance of EHD. The negative polarity slightly outperforms the positive one by 6% due to its higher current density between the electrodes and the grounded surface. In the present study, EHD has been proven as a good cooling technique by showing improved heat transfer at the expense of small power consumption.

摘要    I
Abstract    II
誌謝    III
目錄    IV
圖目錄    VII
表目錄    XI
第一章  緒論    1
1 - 1 前言    1
1 - 2 LED原理介紹    2
1 - 3 白光LED    4
1 - 3 - 1 白光LED發光技術    5
1 - 3 - 2 白光LED散熱問題    6
1 - 3 - 3 LED現階段散熱技術    7
第二章  原理介紹與文獻回顧    16
2 - 1 LED之熱阻    16
2 - 2 LED之冷卻系統    17
2 - 3 EHD技術介紹    19
2 - 3 - 1  EHD原理簡介    20
2 - 3 - 2 電暈氣流    21
2 - 4 EHD文獻回顧    31
2 - 4 - 1 電暈現象方面    31
2 - 4 - 2 EHD散熱方面    31
第三章  實驗設備與方法    43
3 - 1 實驗設備    43
3 - 2 實驗與分析方法    44
3 - 2 - 1 熱電偶之校正    44
3 - 2 - 2 自然對流部分    45
3 - 2 - 3 外加電極部分    49
第四章  實驗結果與討論    66
4 - 1 自然對流部分    66
4 - 2 外加電極部分    69
4 - 2 - 1 電壓高低對EHD之影響    69
4 - 2 - 2 電場極性對EHD之影響    69
4 - 2 - 3 發熱通量高低對EHD之影響    72
4 - 2 - 4 電極距離對EHD之影響    74
4 - 2 - 5 電極間距對EHD之影響    75
4 - 2 - 6 電極架設方式對EHD之影響    77
4 - 2 - 7 電暈氣流之流場觀測紀錄    79
第五章  結論與未來研究方向    100
5 - 1 結論    100
5 - 2 未來研究方向    103
第六章  附錄    105
第七章  參考資料    116

                                

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