Title:

Electrostatic and vapor diffusion effects in coating flows of evaporating liquids

Speaker:

Prof. Vladimir Ajaev

Affiliation:

Southern Methodist University Department of Mathematics

When:

Tuesday, October 26, 2010 at 11:00:00 AM   Add to Calendar

Where:

Love Building, Room 311

Host:

Minami Yoda
minami@gatech.edu
404 894 6838

Abstract

Several widely used models of evaporation near moving contact lines are based on the assumptions that no electric charges are present in the liquid and that the gas phase above the liquid is pure vapor. The first assumption is not adequate for describing many liquids important for heat transfer applications, most notably water and liquid metals. In both of these cases, the electrostatic effects near the contact line can have a significant influence on the value of the apparent contact angle. Furthermore, the gas phase above the liquid is often a mixture of vapor and air, so diffusion of vapor plays an important role in determining the rate of evaporative mass loss at the contact line. Modeling approaches incorporating the effects of electric charges in the liquid and diffusion of vapor through air are the subject of the talk. The key results are illustrated using a simple model of gravity-driven flow over a heated surface and include predictions of apparent contact angles for both steady and moving contact lines, as well as numerical simulations of fingering instability in the presence of evaporation.

Biography

Vladimir Ajaev is Associate Professor of Mathematics at Southern Methodist University in Dallas, Texas. He received his B.S. from the Moscow Institute of Physics and Technology (Russia) in 1994 and his Ph.D. from Northwestern University in 1999. He conducted postdoctoral research in the Chemical Engineering Department at Stanford University and then joined the faculty at SMU in August 2001. Dr. Ajaev is a recipient of Alexander von Humboldt Research Fellowship, as well as several teaching awards at SMU.

Notes

Refreshments will be served.