For more information about this meeting, contact Andrew Belmonte, Hope Shaffer, Tim Reluga.
|Title:||Moving Contact Lines: from Giant Slip on Textured Substrates to Water Striders|
|Seminar:||The Pritchard Lab Seminar|
|Speaker:||James J. Feng, Dept of Mathematics, University of British Columbia - Canada|
|A three-phase contact line forms when a gas-liquid interface intersects a solid substrate, and a moving contact line presents a well-known singularity that cannot be computed using the conventional Navier-Stokes formalism. I will discuss the use of a diffuse-interface model for computing moving contact lines. The Cahn-Hilliard diffusion is known to regularize the singularity and makes possible a continuum-level computation. But relating the results to physical reality is subtle. I will show numerical results that suggest a well-defined sharp-interface limit, with a finite contact line speed that can be related to measurements. Then I will discuss two applications: enhanced slip on textured substrates and propulsion of water striders on an air-water interface.|
Room Reservation Information
|Date:||11 / 15 / 2010|
|Time:||02:30pm - 03:30pm|