Mass Accommodation at Liquid-Vapor Interfaces and Collapsing Vapor Cavities

Seminar | April 30 | 11 a.m.-12 p.m. | 3110 Etcheverry Hall

 Professor Pawel Keblinski, Department Head, Department of Materials Science and Engineering; Rensselaer Polytechnic Institute

 Department of Mechanical Engineering (ME)

Abstract: The relationships expressing the rate of evaporation and condensation at the liquid vapor interface, in terms of local interfacial thermodynamics properties and the mass accommodation coefficient (MAC), is a subject of significant discussion for over a century since the pioneering work of Hertz and Knudsen. In this context, using molecular dynamics (MD) simulations of fluid argon and water with and without non-condensable gases we will demonstrate that so-called Schrage relationships provide highly accurate predictions of the evaporation rates for argon-based systems and less accurate for water. Furthermore, introduction of non-condensable gases in a nano channel allows us to compare the interfacial resistances to the heat and mass transfer and compare it with the corresponding bulk resistances in the gas phase. In the second part of the presentation we will discuss the role of vapor accommodation in a number of processes. In particular, we will examine vapor formation and collapse around solid nanoparticles immersed in a liquid and subjected to an intense heat pulse and comment on the issue of MAC for high-velocity liquid-vapor interfaces.

Biography: Professor Pawel Keblinski received his MS degree at the University of Warsaw and PhD degree at the Pennsylvania State University. After a postdoctoral appointment at Argonne National Laboratory he joined the faculty of Materials Science and Engineering Department at the Rensselaer Polytechnic Institute. Dr. Keblinski is using atomic-level computational methods, including classical molecular dynamics, to study structure-property relationships, most notably in interfacial materials. His main research focus is on modeling of thermal transport at interfaces and in nano-structured materials. His atomic-level simulations and calculations are augmented with continuum-level modeling to provide information on system behavior and properties at larger scales. His work to date resulted in over 190 publications in peer-reviewed journals, and over 120 invited presentations. According to the Google Citation Index, his total number of citations over 21,000 and the associated h-index is 63. Dr. Keblinski is a recipient of a National Science Foundation Career Award, a Humboldt Fellow (Germany), a Fellow of the American Physical Society, a Marie Curie Fellow (Poland and EU Commission) and an Associate Editor of the Journal of Applied Physics., 510-643-2582