CIESC Journal

• Volume 4 • 上一篇    下一篇

COALESCENCE BETWEEN SMALL BUBBLES: EFFECTS OF SURFACE TENSION GRADIENT

李佟茗   

  1. Department of Chemical Engineering, Tianjin University, Tianjin 300072, China
  • 收稿日期:1995-06-05 修回日期:1995-10-03 出版日期:1996-12-28 发布日期:1996-12-28
  • 通讯作者: 李佟茗

COALESCENCE BETWEEN SMALL BUBBLES: EFFECTS OF SURFACE TENSION GRADIENT

LI Dongming   

  1. Department of Chemical Engineering, Tianjin University, Tianjin 300072, China
  • Received:1995-06-05 Revised:1995-10-03 Online:1996-12-28 Published:1996-12-28
  • Contact: LI Dongming

摘要: When two small bubbles approach each other, a dimpled thin liquid film is formed between them. A model is developed for the dynamics of the thinning film with mobile interfaces, in which the effects of interfacial mobility and physical properties on the drainage and rupture of a dimpled liquid film are investigated. The model predicts the coalescence time, which is the time required for the thinning and the rupture of the liquid film, given only the radii of the bubbles and the required physical properties of the liquid and the surface, such as surface tension, London-van der waals constant, and surface diffusion coefficient. The predicted result is in agreement with the experimental results in the literature.

关键词: bubble coalescence;thin film drainage;surface mobility;surface tension gradient

Abstract: When two small bubbles approach each other, a dimpled thin liquid film is formed between them. A model is developed for the dynamics of the thinning film with mobile interfaces, in which the effects of interfacial mobility and physical properties on the drainage and rupture of a dimpled liquid film are investigated. The model predicts the coalescence time, which is the time required for the thinning and the rupture of the liquid film, given only the radii of the bubbles and the required physical properties of the liquid and the surface, such as surface tension, London-van der waals constant, and surface diffusion coefficient. The predicted result is in agreement with the experimental results in the literature.

Key words: bubble coalescence, thin film drainage, surface mobility, surface tension gradient