Oscillatory Driven Cavity with an Air/Water Interface and an Insoluble Monolayer: Surface Viscosity Effects

✍ Scribed by Juan M. Lopez; Amir H. Hirsa

• Book ID: 102583166
• Publisher: Elsevier Science
• Year: 2001
• Tongue: English
• Weight: 78 KB
• Volume: 242
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.2001.7894

✦ Synopsis

Flow in a planar cavity bounded by stationary side walls, a flat gas/liquid interface covered by an insoluble monolayer, and driven by sinusoidal motion of the floor is examined numerically. Navier-Stokes computations with the Boussinesq-Scriven surface model are presented utilizing the equation-of-state measured for a vitamin K 1 monolayer on the air/water interface. The results identify a range of initial surfactant concentration for which the surface velocity is sensitive to the surface viscosity B (sum of surface shear and dilatational viscosities) down to 10 -2 surface Poise. Thus, the study suggests a practical method for determining surface viscosities consisting of the measurement of the motion of a tracer particle on the interface and comparisons with numerical computations at various values of B.