Coalescence: Drainage and Stability of Thin Films

本研究项目涉及与不稳定泡沫有关的薄膜的排水和稳定性。利用单个气泡研究了表面粘度在气液界面聚结过程中的作用。以前工作的前提是，相同的因素既影响相界面上单个气泡或液滴的聚结，也影响多孔介质中不稳定泡沫的置换。本研究项目主要从理论和实验两个方面研究单个气泡或液滴的聚结问题。目前正在开发一种更详细的理论，其中将包括任何静电双层作用力的影响。在此基础上，系统地研究了表面粘度对单气泡在液-气界面聚并时间的影响。这包括两种表面粘度的互补测量。

This research project is concerned with the drainage and stability of thin films which could be associated with unstable foams. The role of surface viscosity in coalescence at liquid-gas interfaces is investigated using single bubbles. The premise of previous work is that the same factors influence both the coalescence of single bubbles or drops at phase interfaces and the displacement of an unstable foam in a porous medium. This research project focuses on studying, both theoretically and experimentally, the problem of the coalescence of single bubbles or drops. A more detailed theory that will include the effects of any electrostatic double-layer forces is currently being developed. Using these theories as a basis, a systematic experimental study of the effects of the surface viscosities upon the coalescence times of single bubbles at liquid-gas interfaces is initiated. This includes complementary measurements of the two surface viscosities.