Spreading of Soluble Surfactant Solutions over a Thin Aqueous Layer on Isothermal Solid Substrate
The spreading of a drop of soluble surfactant over thin aqueous layer in the presence of isothermal heating is considered. Use of lubrication theory yields a coupled pair of partial differential equations for the film thickness, surface and bulk surfactant concentrations. The numerical results by the PDECOL procedure show that droplet patterns are obtained under the isothermal conditions of underlying substrate. The effects of variation of Marangoni parameter and air-liquid Biot number are examined. Decreasing Marangoni parameter leads to flatter drop peak and longer time to rupture. Decreasing the air-liquid Biot number flattens the film thickness and surfactant concentration profile of the drop. In all situations the surfactant is found to rigidity the air-liquid interface, while the thermal capillary acts to destabilize the film.
surfactant soluble thin film liquid drop isothermal heating
LI Chunxi WANG Songling YE Xuemin
Key Lab of Condition Monitoring and Control for Power Plant Equipment (North China Electric Power University), Ministry of Education Baoding P.R.China
国际会议
太原
英文
343-348
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）