MSE Seminar Series: Modeling of heat flow across interfaces
Speaker: Pawel Keblinski, MSE Professor and Department Head, Rensselaer Polytechnic Institute, New York
Title: Modeling of heat flow across interfaces
An interface between two materials poses a resistance to the heat flow, which is addition to the resistance of the bulk of the material. Consequently, materials with high density of interfaces, such as supperlattices, nanocrytalline materials, and nanocomposites, can exhibit thermal conduction that is far lower than values characterizing bulk materials with little or no interfaces. Such thermal conductivity reduction can be advantageous, e.g., in the case of thermal barrier coatings or thermoelectric materials, or detrimental, when the objective is to enable efficient heat dissipation, as is the case for thermal interface materials.
In this presentation, Dr. Keblinski will discus factors determining heat flow across interfaces and the ability of the atomic-level simulation and calculation techniques to shed light on the relative role of these factors, and the relationship between interfacial structure and bonding and interfacial thermal resistance. Furthermore, he will discuss how the information on individual interfaces can be used in continuum-level simulations and homogenization theories to model thermal conduction of nanocomposite materials. Finally a demonstration of how molecular dynamics simulations can significantly contribute to the century old discussion about the relationship between interfacial kinetics and thermodynamic conditions and the rate of evaporation/condensation at liquid-vapor interfaces will be made.
Pawel Keblinski received his M.S. degree form Warsaw University in 1990 and PhD degree from Pennsylvania State University in 1995. After a postdoctoral appointments at Argonne National Laboratory and Forschungszentrum Karlsruhe, he joined the faculty of Rensselaer Polytechnic Institute, Troy NY. His research relies mainly on the use of classical molecular dynamics simulations to study structure-property relationships in interfacial materials, with a focus on thermal transport modeling. His work to date resulted in over 200 publications in peer-reviewed journals and associated H-index of 65 (Google Scholar). He is a recipient of a National Science Foundation Career Award (USA), Humboldt Fellowship (Germany) and Marie Curie Fellowship (EU Commission/Poland). He is also a Fellow of the American Physical Society, and an Associated Editor of the Journal of Applied Physics.