Levich Institute Seminar Announcement, 10/25/2005

Tuesday, 10/25/2005
2:00 PM
Steinman Hall, Room #312
(Chemical Engineering Conference Room)

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


"Nanofluids for Enhanced Thermal Transport: Understanding and Controversy"


(This seminar is co-sponsored by the CREST Center for Mesoscopic Modeling and Simulation)

ABSTRACT

Nanofluids, i.e., fluid suspension of nanometer sized solid particles and fibers, have been proposed as a route for surpassing the performance of currently available heat transfer liquids. Recent experiments on nanofluids have indicated significant increases in thermal conductivity compared to liquids without nanoparticles or with larger particles, strong temperature-dependence of the thermal conductivity, and significant increases in critical heat flux in boiling heat transfer. Some of the experimental results are controversial; e.g., the extent of the enhancement of the thermal conductivity for stationary liquids can greatly exceed the predictions of well-established theories. Potential mechanisms responsible for these unusual thermal conductivity enhancements were proposed, including altered thermal properties of liquids at solid interfaces, Brownian motion of nanoparticles and associated hydrodynamic response of the fluid, particle clustering, and direct thermal energy exchange via dipolar interactions between proximal nanoparticles. We will present a critical examination of these mechanisms via means of theoretical analysis and molecular-level simulations.

BRIEF ACADEMIC/EMPLOYMENT BACKGROUND:
Dr. Keblinski is an associate professor in the Materials Science Department at Rensselaer Polytechnic Institute (RPI). He received his MS degree in Physics from the Warsaw University in 1991 and Ph.D. degree in Physics from the Pennsylvania State University in 1995. Before joining RPI Dr. Keblinski was a postdoctoral researcher at Argonne National Laboratory and worked at Forschungszentrum Karlsruhe in Germany as a recipient of an Alexander von Humboldt Fellowship. He is also a recipient of the NSF Career Award. Professor Keblinski is a leader of the modeling group in the NSF Nasoscale Science and Engineering Center for Directed Assembly of Nanostructures at RPI and UIUC. Throughout his career Dr. Keblinski used atomic and mesoscale level computational methods to study structure-property relationships in various materials. His main research focus is on modeling of thermo-mechanical properties of interfacial and nano-structured materials, including carbon based systems, polymer nanocomposites, and various solid-solid, solid-liquid and liquid-liquid interfaces.