物理化学学报 >> 1995, Vol. 11 >> Issue (11): 997-1003.doi: 10.3866/PKU.WHXB19951108

研究论文 上一篇    下一篇

两个液滴之间的聚并

刘世平,李佟茗,贾绍义   

  1. 天津大学化学工程系,天津 300072
  • 收稿日期:1995-01-03 修回日期:1995-04-20 发布日期:1995-11-15
  • 通讯作者: 李佟茗

Coalescence between Two Small Liquid Drops

Liu Shi-Ping,Li Tong-Ming,Jia Shao-Yi   

  1. Department of Chemical Engineering,Tianjin University,Tianjin 300072
  • Received:1995-01-03 Revised:1995-04-20 Published:1995-11-15
  • Contact: Li Tong-Ming

摘要:

对于系统中不含杂质时两个液滴在不互溶液体中的聚并过程进行理论分析,得到聚并所需时间与两相物理性质和范德华力的关系.该结果也适用于气泡在液体中的聚并.只要知道系统的物性数据和液滴半径,就可以计算聚并时间.理论预测与实验结果符合较好.

关键词: 液滴, 薄液膜, 聚并时间

Abstract:

The coalescence process between two small drops of different sizes in pure liquid-liquid dispersions has been studied. When two small drops approach each other, a dimpled thin liquid film is formed between them. A model is developed for the dynamics of the thinning film in which the influence of London-van der Waals force has been considered. The model predicts that the coalescence time, which is the time required for the thinning and rupture of the liquid film, can be expressed only by the radii of the drops and the physical properties of two phases.  A wide range of viscosity ratio of dispersed phase to continuous phase is examined, so that the theoretical prediction is also valid for bubble coalescence in a liquid. It is shown that the coalescence times are strongly dependent on the viscosity ratios. The prediction results are in good agreement with the previous experimental results.

Key words: Drop, Thin liquid film, Coalescence time