研究生: |
YILMA TADESSE BIRHANE YILMA - TADESSE BIRHANE |
---|---|
論文名稱: |
Performance of Electrohydrodynamic Gas Pumps and Heat Transfer Enhancement in Circular Tubes Performance of Electrohydrodynamic Gas Pumps and Heat Transfer Enhancement in Circular Tubes |
指導教授: |
林顯群
Lin Sheam-Chyun Feng-Chyuan Lai Feng-Chyuan Lai |
口試委員: |
Yen-Wen Chen
Yen-Wen Chen Yang, Shiuh-Kuang Yang, Shiuh-Kuang Zone-Ching Lin Zone-Ching Lin 黃緒哲 Shiuh-Jer Huang 向四海 Su-Hai Hsiang Kou, Hong-Sen Kou, Hong-Sen |
學位類別: |
博士 Doctor |
系所名稱: |
工程學院 - 機械工程系 Department of Mechanical Engineering |
論文出版年: | 2015 |
畢業學年度: | 103 |
語文別: | 英文 |
論文頁數: | 218 |
外文關鍵詞: | Electrohydrodynamics(EHD), Performance of EHD Gas Pump, Circular Tube EHD Gas Pump, Single-stage EHD gas pump, Two-stage EHD gas pump |
相關次數: | 點閱:195 下載:0 |
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本研究針對圓管電液動氣體泵浦(EHD pump)進行系統化的實驗分析,選定的EHD結構是八根放電電極等距地安裝在泵浦管壁面。而所探討的設計參數包括管徑(61.8mm與127.8mm)、電極間距(25mm與50mm)以及級數單級與雙級等
。同時雙級的氣體泵浦實驗參數又考慮電極錯位擺放(Offset)與電極平行(Align)擺放,以及在第一級與第二級間的電壓升、降對流體所造成的影響;實驗規則採用正電暈放電,且操作電壓的範圍由17.5kV到30kV。實驗結果顯示電液動氣體泵浦所產生的速度分布為反向的拋物線,其速度在越接近管壁越大、接近管中心越小;同時觀察出氣體泵浦的流率隨著操作電壓的上升而增加,且在接近火花放電電壓時趨近於一極限。除此之外本研究也呈現先前實驗歸納所得之結果,以及在工程實際應用上的建議。另外EHD泵浦在熱傳強化分析方面,本研究以具體驗證電液動氣體泵浦之效益特殊設計壹組垂直擺放之圓管加熱器觀察散熱特性的強化;實驗項目包括在多種熱通量在不同操作電壓下的熱對流係數,實驗結果顯示電液動氣體泵浦可以有效的增加散熱特性。另外結果分析也歸納出無因次化參數-紐賽數(Nusselt number)與不同高度圓管加熱器的關係,同時研究也指出,加熱器的自然對流會對電液動散熱技術的強制對流造成附加效果。
Flow characteristics of electrohydrodynamic induced gas pumps in circular tubes has been experimentally evaluated in this work. The gas pumps use eight evenly spaced emitting electrodes which are flush mounted on the tube wall. Two tube diameters (61.8 mm and 127.8 mm) and two electrode gap distances (25 mm and 50 mm) have been considered for both single-stage and two-stage EHD pumps. For two-stage cases electrodes aligned and offset orientations are investigated. Additionally, the effect of ascending or descending order of applied voltages on the two-stage EHD gas pump at flow dominant areas is examined. Experiments are conducted using positive corona discharge with voltage varying from 17.5 kV to 30 kV depending on required parameters.
As a result, flows induced by the pumps have an inverted parabolic profile with a higher velocity near the wall and a lower velocity at the tube center. The results also show that the volume flow rate increases with the applied voltage but approaches an asymptotic value before sparkover takes place. Several important implications from the present results for practical engineering applications are presented. Heat transfer analysis of a targeted thermal management (thermal cooling) for special designed circular heater is investigated to evaluate the EHD pump effectiveness in enhancing the heat transfer.
The convective heat transfer coefficient for different constant-heat fluxes at various applied voltages of EHD gas pump is studied. And it is shown that the Nusselt number is the reciprocal of the non-dimensional surface temperature of the heater tube. Also the EHD gas pump induced forced convection effectively enhances the heat transfer aided by the natural convection.
The variation of vertical height of the circular tube heater and non-dimensional Nusselt number is evaluated and it shows that the Nusselt ratio decreases with the height of the heater tube which in fact signifies heat transfer enhancement.
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