Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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A study on the deformation of a bubble and a drop in a uniform electric field

균일전기장에 의한 기포와 액적의 변형에 관한 연구

  • Gwon, Yeong-Cheol (Dept. of Mechanical Engineering, Pohang University of Science and Technology) ;
  • Kim, Mu-Hwan (Dept. of Mechanical Engineering, Pohang University of Science and Technology) ;
  • Gang, In-Seok (Dept. of Chemistry Engineering, Pohang University of Science and Technology) ;
  • Cho, Hae-Jung (Dept. of Chemistry Engineering, Pohang University of Science and Technology) ;
  • Kim, Suk-Joon (KIMM)
  • 권영철 (포항공과대학교 기계공학과) ;
  • 김무환 (포항공과대학교 기계공학과) ;
  • 강인석 (포항공과대학교 화학공학과) ;
  • 조혜정 (포항공과대학교 화학공학과) ;
  • 김석준 (한국기계연구원)
  • Published : 1996.06.01
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Abstract

In the present study, the characteristics of the electrical deformation of a bubble and a drop under a uniform electric field have been investigated to understand EHD heat transfer enhancement by an electric field. The deformation of the bubble and the drop have been studied theoretically using an electric normal stress acting on their interfaces and assured by the numerical analysis and the experiment. From the variation of bubble volume and free energy, it is found that a bubble is compressed in an electric field and free energy had larger value with increasing W and the permittivity of a dielectric fluid. The electric normal stress induced on the interface of the bubble and the drop is different. Because of the surface charge induced at the drop interface, the electric normal stress acting on the drop is much larger than that of the bubble. The drop is, therefore, deformed much more than the bubble. In addition, the experimental and numerical results show that the aspect ratio and the contact angle of the bubble increase with increasing W.

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References

  1. Advances in Heat Transfer v.14 Electrohydrodynamically Enhanced Heat Transfer in Liquids-A Review Jones, T. B.
  2. Int. J. Heat Mass Transfer v.36(3) Basic Study on the Enhancement of Nucleate Boiling Heat Transfer by Applying Electric Fields Ogata, J.;Yabe, A.
  3. Heat Transfer Science and Technology Augmentation of Condensation Heat Transfer around Vertical Cooled Tubes Provided with Helical Wire Electrodes by Applying nonuniform Electric Fields Yabe, A.;Taketani, T.;kikuchi, K.;Mori, Y.;hijikata, K.
  4. Int. J. Heat Mass Transfer v.24 Vapor Film Condensation Heat Transfer and Hydrodynamics under the Influence of an Electric Field Didkovsky, A. B.;Bologa, M. K.;
  5. Proc. Roy. Soc. Bubbles in Insulating Liquids: Stability in an Electric Field Garton, C. G;Krasucki, Z.
  6. Ann. Rev. Mech. v.1 A Review of the Role of Interfacial Shear Stress Melcher, J. R.;Taylor, G. I.
  7. Phys. Fluids v.24(11) Shape of a Drop in an Electric Field Miksis, M. J.
  8. Int. J. Heat and Mass Flow v.7 Maximum Size of Bubbles during Nucleate Boiling in an Electric Field Cheng, K. J.;Chaddock, J. B.
  9. Int. J. Heat Mass Transfer v.36(3) Basic Study on the Enhancement of Nucleate Boiling Heat Transfer by Applying Electric Fields Ogata, J;Yabe, A.
  10. J. Fluid Mech v.235 Shapes and Stability of Pendant and Sessile Dilectric Drops in an Eletric Field Wohlhuter, F. K.;Basaran, O. A.
  11. Pro. 3rd JSME-KSME Fluids Engineering Conf. Study on the deformation and Departure Processes of a Bubble under an Electric Field Kweon, Y. C.;Kim, M. H.;Cho, H. J.;Kang, I. S.;Kim, S. J.
  12. 대한기계학회논문집 v.19 no.6 직류전기장에 의한 기포의 변형과 이탈에 관한 연구 Kweon, Y. C.;Kim, M. H.;Cho, H. J.;Kang, I. S.;Kim, S. J.
  13. proceedings of the 2nd International Conf. on Multiphase Flow v.4 The Effects of Electric Field on the Behaviors of a Bubble Attached to the Wall in an Electric Field(steady shape and fluid motion) Cho, H. J;Kang, I. S.;Kweon, Y. C.;Kim, M. H.;Kim, S. J.
  14. Electromagnetic Theory Stratton, J. A.
  15. Proc. Phys. Soc. v.80 An Experimental Determination of the Excess Pressure Produced in a Liquid Dielectric by an Electric Field Hakim, S. S.;Higham, J. B.
  16. Static and Dynamic Electricity Smythe, W. R.
  17. Electrodynamics of Continuous Media : Course of Theoretical Physics Volume 8 v.8 Landau, L. D.;Lifshitz, E. M.
  18. Foundations of Electromagnetic Theory Reitz, J. R.
  19. Int. J. Heat and Fluid Flow v.7(4) maximum Size of Bubbles during Nucleate Boiling in an Electric Field Cheng, K. J.;Chaddock, J. B.
  20. J. Fluid Mech. v.148 Numerical Solution of Free-Boundary Problems in Fluid Mechanics(Part 1. The Finite-Difference Technique) Ryskin, G.;Leal, L. G.
  21. IEEE Transactions on Power Apparatus and System. v.PAS-104(2) Analysis of Calibration Arrangments for AC Field Strength Meters Takuma, T.;Kawamoto, T.;Sunaga. Y.
  22. proceedings of the 2nd International Conf. on Multiphase Flow v.4 A Study on the Behaviors of a Bubble Attached to the Wall in an Electric Field(steady shape and fluid motion) Cho, H. J;Kang, I. S.;Kweon, Y. C.;Kim, M. H.;Kim, S. J.