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

The Korean Society of Mechanical Engineers (대한기계학회)
권호 표지
DOI QR코드

DOI QR Code

Experimental study on nucleate boiling heat transfer enhancement using an electric field

전기장을 이용한 핵비등 열전달 촉진에 관한 실험적 연구

  • 권영철 (한국전력공사 전력연구원 기계공학연구소) ;
  • 김무환 (포항공과대학 기계공학과) ;
  • 강인식 (포항공과대학 화학공학과)
  • Published : 1997.12.01
Download PDF
⟨ Previous Next ⟩

Abstract

To understand EHD nucleate boiling heat transfer enhancement, EHD effects on R-113 nucleate boiling heat transfer in a non-uniform electric field were investigated. The pool boiling heat transfer and the dynamic behavior of bubbles in d.c./a.c. electric fields under a saturated or subcooled boiling were studied by using a plate-wire electrode and a high speed camera. From the pool boiling heat transfer study, the shift of the pool boiling curve, the increase of the heat transfer and the delay of ONB and CHF points to higher heat fluxes were observed. From the dynamic behavior of bubbles, it was observed that bubbles departed away from the whole surface of the heated wire in radial direction due to EHD effects by a nonuniform electric field. With increasing applied voltages, the bubble size decreased and the active nucleation site and the departure number of bubbles showed the different trend. The present study indicates that the EHD nucleate boiling heat transfer is closely connection with the dynamic behavior of bubbles and the secondary flow induced near the heated surface. Therefore, the basic studies on the bubble behavior such as bubble frequency, bubble diameter, bubble velocity and flow characteristics are necessary for complete understanding of the enhancement mechanism of the boiling heat transfer using an electric field.

Keywords

References

  1. 8th Int. Heat Transfer Conf. v.6 Electro-hydrodynamically Augmented Heat and Mass Transfer in the Shell/Tube Heat Exchanger Poulter, R.;Allen, P. H. G
  2. Transactions of the ASME v.112 EHD Enhancement of Nucleate Boiling Cooper, P.
  3. ASHRAE Transactions Symposia EDH Enhancement of Shell-Side Boiling Heat Transfer Coefficients of R-123/Oil Mixture Ohadi, M. M.;papar, R. A.;Ng, T. L.;Faani, M. A.;Radermacher, R.
  4. Int. J. Heat Mass Transfer v.36 Augmentation of Boiling Heat Transfer By Utilizing the EHD Effect-EHD Behavior of Boiling Bubbles and Heat Transfer Eharacteristics Ogata, J.;Yabe, A.
  5. ASHRAE Transactions Symposia In-Tube Boiling Heat Transfer Enhancement of R-123 Using the EHD Technique Singh, A.;Ohadi, M. M.;Dessiatoun, S.;Chu, W.
  6. ASHRAE Transactions Symposia Practical Design Aspects of EHD Heat Transfer Enhancement in evaporators Cooper, P.
  7. 공기조화냉동공학논문집 v.6 no.4 Chiller용 냉매 CFC-11과 대체냉매 HCFC-123의 전기장을 사용한 핵비등 열전달 촉진에 관한 연구 곽태희;김주형;정동수;김종보;차태우;한창섭
  8. 대한기계학회논문집(B) v.20 no.7 전기장하에서의 비등열전달 촉진에 관한 실험적 연구 오시덕;곽호영
  9. 대한기계학회논문집 v.19 no.6 직류전기장에 의한 기포의 변형과 이탈에 관한 연구 권영철;김무환;조혜정;강인석;김석준
  10. 대한기계학회논문집(B) v.20 no.6 균일전기장에 의한 기포와 액적의 변형에 관한 연구 권영철;김무환;조혜정;강인석;김석준
  11. Int. J. Multiphase Flow Study on the Deformation and Departure of a Bubble Attached to a Wall in D.C./A.C. Electric Fields Kweon, Y. C.;Kim, M. H.;Cho, H. J.;Kang, I. S.
  12. Int. J. Multiphase Flow v.22 Study on the Behavior of a Bubble Attached to the Wall in a Uniform Electric Fiedl Cho, H. J.;Kang, I. S.;Kweon, Y. C.;Kim, M. H.
  13. Electromagnetic Theory Statton, J. A.
  14. 과학기술처 보고서 EHD에 의한 열전달 촉진 기술 개발 권영철;김무환;조혜정
  15. Physics Fluids v.11 Electroconvective Instability with a Stabilizing Temperature Gradient. (I. Theory) Turnbull, R. J.
  16. Mechanical Engineering v.75 Describing Uncertainties in Single Sample Experiments Kline, S. J.;McClintock, F. A.
  17. Electromagnetics Kraua, J. D.
  18. Ph. D. Thesis, Dep. Mech. Eng. Electrohydrodynamics Boiling Heat Transfer Choi, H. Y.
  19. Ph. D. Thesis, Dep. Chem. Eng. Boiling Heat Transfer in the Presence of Electric Fields Lovenguth, R. F.
  20. J. Phys. D :Appl. Phys. v.10 Electric-Field-Enhanced Conductivity in Dielectrics Adamec, V.;Calderwoodm, J. H.