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

Authors: Lopez J.M.¹; Hirsa A.H.²

Source: Journal of Colloid and Interface Science, Volume 242, Number 1, October 2001 , pp. 1-5(5)

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Abstract:

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 K₁ 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. Copyright 2001 Academic Press.

Language: English

Document Type: Short communication

Affiliations: 1: Department of Mathematics, Arizona State University, Tempe, Arizona, 85287-1804 2: Department of Mechanical Engineering, Aeronautical Engineering, and Mechanics, Rensselaer Polytechnic Institute, Troy, New York, 12180-3590

Publication date: 2001-10-01