SCI和EI收录∣中国化工学会会刊

›› 2008, Vol. 16 ›› Issue (2): 178-183.

• TRANSPORT PHENOMENA & FLUID MECHANICS • Previous Articles     Next Articles

Single Bubble Behavior in Direct Current Electric Field

PENG Yao, CHEN Feng, SONG Yaozu, CHEN Min   

  1. School of Aerospace, Tsinghua University, Beijing 100084, China
  • Received:2007-01-29 Revised:2008-02-04 Online:2008-04-28 Published:2008-04-28
  • Supported by:
    the National Key Basic Research Program of China (G2000026301);Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, China

Single Bubble Behavior in Direct Current Electric Field

彭耀, 陈凤, 宋耀祖, 陈民   

  1. School of Aerospace, Tsinghua University, Beijing 100084, China
  • 通讯作者: SONG Yaozu,E-mail:songyz@tsinghua.edu.cn
  • 基金资助:
    the National Key Basic Research Program of China (G2000026301);Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, China

Abstract: The investigation on bubble behavior in electric field helps to analyze the mechanism of electric enhancement of boiling heat transfer. Experiments were performed to investigate the bubble deformation in direct current (DC) electric field with bubbles attached to the orifice. The air bubbles were slowly generated in the transformer oil pool at different orifices, so that the effect of flow on bubble shape was eliminated. The results showed that the bubbles were elongated and the departure volume decreased when the electric field was intensified. The major and minor axes, aspect ratio and departure volume increased with increasing the orifice diameter. Both the electric field and orifice size have great influence on bubble behavior. The bubble deformation was also simulated to compare with the experimental results. The numerical and experimental data qualitatively agree with each other.

Key words: electrohydrodynamic enhancement, multiphase flow, bubble behavior, direct current electric field

摘要: The investigation on bubble behavior in electric field helps to analyze the mechanism of electric enhancement of boiling heat transfer. Experiments were performed to investigate the bubble deformation in direct current (DC) electric field with bubbles attached to the orifice. The air bubbles were slowly generated in the transformer oil pool at different orifices, so that the effect of flow on bubble shape was eliminated. The results showed that the bubbles were elongated and the departure volume decreased when the electric field was intensified. The major and minor axes, aspect ratio and departure volume increased with increasing the orifice diameter. Both the electric field and orifice size have great influence on bubble behavior. The bubble deformation was also simulated to compare with the experimental results. The numerical and experimental data qualitatively agree with each other.

关键词: electrohydrodynamic enhancement, multiphase flow, bubble behavior, direct current electric field