Event
FDR Seminar | Wetting and Electrohydrodynamics of Soft Particles
Friday, April 24, 2015
11:00 a.m.
Johan Larsson
jola@umd.edu
http://www.enme.umd.edu/events/fluid-dynamics-review-seminars
Fluid Dynamics Reviews Seminar Series
WETTING AND ELECTROHYDRODYNAMICS OF SOFT PARTICLES
Speaker: Siddhartha Das
University of Maryland
Abstract:
In this talk, two extremely important facets of soft interfaces, namely its wetting and electrohydrodynamics, will be discussed. The wetting motion of a liquid on a rigid solid is a multi-scale problem in which viscous effects at microscopic scales modify the macroscopic liquid contact angle. Our theory shows that a contact line moving on a soft elastic substrate also leads to a dynamic contact angle, but this time, in the solid. For example, we calculate the dynamic shape of the solid ridge formed under the TPCL and show that its tilt angle depends on the contact line velocity. Our theory is corroborated by dynamic wetting experiments of water on silicone gels. The second part of the talk will discuss our recent findings on the thermodynamics of soft, charged interfaces. Our theory emphasizes the need for considering explicit hydrogen ion number density in the thermodynamic description for the case where such interfaces exhibit pH-dependent charge density. Consequences of such consideration in electrostatics, charge inversion, and electrohydrodynamics of such interfaces will be discussed.
Bio: Dr. Siddhartha Das joined the Department of Mechanical Engineering, University of Maryland, College Park in March, 2014. Dr. Das received his Ph.D. from the Indian Institute of Technology Kharagpur in 2010 and did Postdocs in the Physics of Fluids Group in University of Twente, the Netherlands and the Department of Mechanical Engineering, University of Alberta, Canada. In Alberta, Dr. Das was honored with the Banting Postdoctoral Fellowship, the most prestigious postdoctoral fellowship of Canada. Dr. Das’ research interests span different areas of micro-nanoscale fluid
The Fluid Dynamics Reviews (FDR) Seminar Series covers topics in the thermal, fluids and combustion sciences across all scientific and engineering disciplines.
