Title

以EHD技術增強熱傳之研究

Translated Titles

Heat Transfer Enhanced by EHD Technology

Authors

謝維哲

Key Words

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

PublicationName

清華大學動力機械工程學系學位論文

Volume or Term/Year and Month of Publication

2008年

Academic Degree Category

碩士

Advisor

許文震

Content Language

繁體中文

Chinese Abstract

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。

Topic Category 工學院 > 動力機械工程學系
工程學 > 機械工程
Reference
  1. 2.Robinson, M., “Movement of Air in the Electric Wind of the Corona Discharge,” Transactions of the American Institute of Electrical Engineers, V. 80, pp. 143-150 (1961).
    連結:
  2. 3.Hauksbee, F., “Physico-Mechnical Experiments on Various Subjects,” 1st ed., London, pp. 46-47 (1719).
    連結:
  3. 5.Robinson, M., “Movement of Air in the Electric Wind of the Corona Discharge,” Transactions of the American Institute of Electrical Engineers, V. 80, pp. 143-150 (1961).
    連結:
  4. 6.McDonald, J.R., Smith W.B. and Spencer H.W., “A Mathematical Model for Calculating Electrical Conditions in Wire-Duct Electrostatic Precipitation Devices,” Journal of Applied Physics, V. 48, N. 6, pp2231-2243 (1977).
    連結:
  5. 7.Bonder, H., and F. Bastien, “Effect of Neutral Fluid Velocity on Direct Conversion from Electrical to Fluid Kinetic Energy in an Electro-Fluid-Dynamics (EFD) Drive,” Journal of Physics D: Applied Physics, V. 19, pp. 1657-1663 (1986).
    連結:
  6. 8.Lowke , J. J. and R. Morrow, “Theory of Electric Corona including the Role of Plasma Chemistry,” Pure and Applied Chemistry, V.66, N.6, pp.1287-1294 (1991).
    連結:
  7. 9.Chang, J. S., P. A. Lawless and T. Yamamoto, “Corona Discharge Processes,” IEEE Transactions on Plasma Science, V.19, N.6, pp.1152-1166 (1991).
    連結:
  8. 10.Lai, F. C. and Sharma R.K., “EHD-Enhanced Drying with Multiple Needle Electrode,” Journal of Electrostatics, V. 63, pp.223-237 (2005).
    連結:
  9. 11.Hiroyuki Kawamoto and Shinjiro Umezu, “Electrohydrodynamic Deformation of Water Surface in a Metal Pin to Water Plate Corona Discharge System, ”Journal of Physics, pp.887-894 (2005).
    連結:
  10. 12.O’Brien, R. J. and A. J. Shine, “Some Effects of an Electric Field on Heat Transfer from a Vertical Plate in Free Convection,” Journal of Heat Transfer, V. 89, pp. 114-116 (1967).
    連結:
  11. 14.Mitchell, A. S. and L. E. Williams, “Heat Transfer by the Corona Wind Impinging on a Plate Surface,” Journal of Electrostatics, V. 5, pp. 309-324 (1978).
    連結:
  12. 15.Ohadi, M. M., D. A. Nelson and S. Zia, “Heat Transfer Enhancement of Laminar and Turbulent Pipe Flow via Corona Discharge,” International Journal of Heat and Mass Transfer, V. 34, pp. 1175-1184 (1991).
    連結:
  13. 16.Owsenek, B. L., J. Seyed-Yagoobi and R. H. Page, “Experimental Investigation of Corona Wind Heat Transfer Enhancement with a Heated Horizontal Flat Plate,” Journal of Heat Transfer, V. 119, pp. 309-315 (1995).
    連結:
  14. 17.Owsenek, B. L. and J. Seyed-Yagoobi, “Theoretical and Experimental Study of Electrohydrodynamic Heat Transfer Enhancement through Wire-Plate Corona Discharge,” Journal of Heat Transfer, V. 119, pp. 604-610 (1997).
    連結:
  15. 18.Bhattacharyya, S. and A. Peterson, “Corona Wind-Augmented Natural Convection – Part 1: Single Electrode Studies,” Journal of Enhancement Heat Transfer, V. 9, pp. 209-219 (2002).
    連結:
  16. 20.Zhao, L. and K. Adamiak, “EHD Flow in Air Produced by Electric Corona Discharge in Pin-Plate Configuration,” Journal of Electrostatics, V. 63, pp. 337-350 (2005).
    連結:
  17. 21.Boutlendj N. L., Allen, H. A. Lightfoot and R. B. Neville, “Positive DC Corona and Sparkover in Short and Long Rod-plane Gaps under Variable Humidity Conditions,” IEE Proceedings-A, V. 138, No. 1, pp. 31-36 (1991).
    連結:
  18. 22.L. Fouad and S. Elhazek, “Effect of Humidity on Positive Corona Discharge in a Three Electrode System, ”Journal of Electrostatics, V.35, pp. 21-30 (1995).
    連結:
  19. 23.I. A. Metwally, “Factors Affecting Corona on Twin-point Gaps under DC and AC HV, ”IEEE , pp.544-553(1996).
    連結:
  20. 24.P. A. Calva and F. P. Espino C., “Threshold Curves of the Various Modes of Corona Discharge in Atmospheric Air,”IEEE, pp.612-615 (1997).
    連結:
  21. 25.P. A. Calva and F. P. Espino C., “Effect of the Humidity in the Ionic Mobility in Reduced Air-Density,” IEEE , pp. 508-511 (1998).
    連結:
  22. 26.Luc Léger, Eric Moreau, and Gérard G. Touchard, “Effect of a DC Corona Electrical Discharge on the Airflow Along a Flat Plate,” IEEE Transaction on Industry Applications, V. 38, No. 6, pp. 1478-1485 (2002).
    連結:
  23. 27.李幸勇, “陣列式針狀電極應用於EHD熱傳增強技術,” 碩士論文,動力機械工程學系, 國立清華大學 (2005).
    連結:
  24. 29.Evans, R. W. and I. I. Inculet, “The Radius of the Visible Ionization Layer for Positive and Negative Coronas,” IEEE Transactions on Industry Applications, V. IA-14, No. 6, pp. 523-525 (1978).
    連結:
  25. 30.Chapman, B., “Glow Discharge Processes :/Sputtering and Plasma Etching /,” Wiley, New York (1980).
    連結:
  26. 32.財團法人工業技術研究院,國家度量衡標準實驗室.
    連結:
  27. 33.Radiziemska, E. and W. M. Lewandowski, “The Effect of Plate Size on the National Convective Heat Transfer Intensity of Horizontal Surfaces,” Heat Transfer Engineering, V.26, pp.50-53 (2005).
    連結:
  28. 34.Al-Arabi, M. and M. K. El-Riedy, “Natural Convection Heat Transfer from Isothermal Horizontal Plates of Different Shapes,” International Journal of Heat and Mass Transfer, V.19, pp.1399-1404 (1974) .
    連結:
  29. 35.張兆秋, “鰭片底面裝置針狀電極之EHD增強散熱技術研究,” 碩士論文,動力機械工程學系, 國立清華大學 (2006).
    連結:
  30. 1.范盛然, “低溫環境下鰭片結霜研究,” 碩士論文, 動力機械工程學系, 國立清華大學 (2003).
  31. 4.Stuetzer, O. M., “Ion Drag Pressure Generation,” Journal of Applied Physics, V. 30, N. 7, pp. 984-994 (1959).
  32. 13.Kibler, K. G. and H. G. Carter Jr, “Electrocooling in Gases,” Journal of Applied Physics, V. 45, No. 10, pp. 4436-4440 (1974).
  33. 19.Kasayapanand, N. and T. Kiatsiriroat, “EHD Enhance Heat Transfer in Wavy Channel,” International Communications in Heat and Mass Transfer, V. 32, pp.809-821 (2005).
  34. 28.Junhong, C., “Direct-Current Corona Enhanced Chemical Reactions”, Phd Thesis, University of Minnesota, USA, (August 2002).
  35. 31.顏世雄, 粘孝先, 溫坤禮 ,“高壓放電工程,”全華科技圖書股份有限公司.