Stabilization mechanism of a liquid sheet formed with aqueous surfactant solution

2014 Fiscal Year Final Research Report

• Project/Area Number: 24560204
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Fluid engineering
• Research Institution: Osaka City University
• Principal Investigator: WAKIMOTO Tatsuro 大阪市立大学, 大学院工学研究科, 准教授 (10254385)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 界面活性剤 / 液膜 / 安定性 / サーモキャピラリー / 表面張力

Outline of Final Research Achievements

To investigate stabilization mechanism of liquid sheets formed with aqueous surfactant solutions (soap films), slight force was applied to the liquid sheet non-invasively, and time variable sheet thickness was measured optically until the rupture of the liquid sheet. The slight force was created using thermo-capillary effect. When the soap film is heated locally with a laser, spatial temperature distribution induces Marangoni force. Marangoni force pulls the heated spot outward and causes the rupture. Measured thickness of the liquid sheet demonstrates that the liquid sheet hardly moves untill the Marangoni force reaches a certain value and then ruptures suddenly. This brittle fracture is very discriminative for the soap film. We also demonstrate the relation between rupture time and Marangoni force and consider the dependency of the rupture time on the molecular adsorption density.

Free Research Field

流体工学