Effect of Low-Reynolds Number Flow On Surfactant Transport to a Stationary Spherical Cap: Experiments and Theory

Monday, November 8, 2010
Hall 1 (Salt Palace Convention Center)
Nicolas Alvarez1, Lynn Walker1 and Shelley L. Anna2, (1)Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA, (2)Departments of Mechanical Engineering and Chemical Engineering, Carnegie Mellon University, Pittsburgh, PA

Using a newly developed tool, denoted a microtensiometer, surfactant transport to microscopic interfaces is measured by simultaneously measuring the pressure jump across the interface and the radius of the interface. Using this apparatus, we impose low-Reynolds number flow parallel to the capillary at which a spherical fluid-fluid interface is pinned (i.e. as in co-flow). The surfactant is dissolved in the liquid outside of the bubble/drop interface. We examine the role of the co-flow on the dynamics of surfactant transport to the interface and interpret these results in the context of an advection-diffusion model of soluble amphiphiles undergoing a co-flow parallel to the interface.

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See more of this Session: Poster Session: Fluid Mechanics
See more of this Group/Topical: Engineering Sciences and Fundamentals