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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
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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.

    Table of Contents Abstractii Acknowledgmentiv Table of Contentsv Nomenclatureviii Table Captionsxi Figure Captionsxi CHAPTER 1 Introduction1 1.1 Background1 1.2 Literature Review2 1.3 Objective and Scope of the Research21 CHAPTER 2 Experimental Design and Apparatus23 2.1 Experimental Setup and Apparatus for Flow Measurement23 2.2 Experimental Setup and EHD Test Pump Deign for Single-Stage EHD Pump30 2.3 Experimental Procedures32 2.4. Experimental Setup of Two-Stage EHD Pump35 2.5 Heat Transfer Experimental Setup Design43 2.6 Experimental Layout and Procedures of the Heat Transfer Setup46 CHAPTER 3Entrance Length and Flow Characteristics of Single-Stage EHD Pump52 3.1 Variation of Entrance Length Effect on EHD Pump Performance52 3.2 Flow Characteristics of Small Diameter Single-stage EHD Gas Pump60 3.3 Flow Characteristics of Small diameter Single-Stage EHD Gas Pump75 3.4 Flow Characteristics of Large Diameter Single-Stage-EHD Gas Pump78 3.5 Volume Flowrate and Performance of Single-Stage-EHD Pump80 3.6 Effect of Electrode Length on the Performance of EHD Gas Pump83 CHAPTER 4 Flow Characteristics of Two-Stage EHD Gas Pumps90 4.1 Applied Voltage and Current Characteristics90 4.2 Velocity Distribution - Aligned and Offset94 4.3 Discharge Delivered - Aligned and Offset105 4.4 Performance of Two-Stage Pump109 CHAPTER 5 Effect of Applied Voltage Variation on the Two-Stage EHD Pump111 5.1 Flow Dominant Positions Defined for Ascending and Descending Orders111 5.2 Near Wall Region and Radial Sampling Points114 5.3 Applied Voltage and Current Trend114 5.4 Flow Dominant Regions114 5.5 Streamwise Velocity126 5.6 Flow Characteristics in Ascending and Descending Orders134 5.7 Flow Behaviour at Near Wall139 CHAPTER 6 Experimental Heat Transfer Validation of EHD Gas Pump146 6.1 Temperature Variation over the Heater Surface146 6.2 Heat Transfer Mathematical Formulations148 6.3 Cooling Characteristics of EHD Pump154 6.4 Change in Surface Temperature157 6.5 Local Heat Transfer Coefficient Variation with Applied Voltage160 6.6 Variation of Heat Transfer over Vertical Height of The Heater167 6.7 Change in Nusselt Number due to the Corona Wind174 6.8 Variation of EHD Induced Convection with Natural Convection176 CHAPTER 7 Conclusion and Recommendation183 7.1 Conclusion183 7.2 Recommendation188 References190

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