Qualcomm Microsystems Seminar: Evelyn Wang, "Nanoengineered Surfaces for Thermal Energy Application"
Wednesday, February 26, 2014
1146 A.V. Williams Building
Qualcomm Microsystems Seminar Series
Nanoengineered Surfaces for Thermal Energy Applications
Associate Professor, Mechanical Engineering
Massachusetts Institute of Technology
Nanoengineered surfaces offer new possibilities to manipulate fluidic and thermal transport processes for a variety of applications including lab-on-a-chip, thermal management, and energy conversion systems. In this talk, I will discuss fundamental studies of wetting and droplet behavior on nanoengineered surfaces, and the effect of manipulating these fluid-structure interactions on phase-change processes for enhanced heat transfer. I will show that during condensation, nanoengineered surfaces can harness droplets that jump and gain a net positive charge. Accordingly, electric fields can be used to further enhance condensation heat transfer coefficients by approximately 100% compared to state-of-the-art dropwise condensation. I will also discuss the opportunities with nanoengineered surfaces to increase efficiency in solar thermophotovoltaic devices. The use of such surfaces allows us to engineer the spectral properties and to define the active area of the emitter with respect to the absorber. Accordingly, we report efficiencies 3 times greater than those previously reported. These studies provide important insights into the complex physical processes underlying heat-structure interactions and offer a path to achieving increased efficiency in next generation energy systems.
Evelyn N. Wang is an Associate Professor in the Mechanical Engineering Department at MIT. She received her BS from MIT in 2000 and MS and PhD from Stanford University in 2001, and 2006, respectively. From 2006-2007, she was a postdoctoral researcher at Bell Laboratories, Alcatel-Lucent. Her research interests include fundamental studies of micro/nanoscale heat and mass transport and the development of efficient thermal management, water desalination, and solar thermal energy systems. Her work has been honored with awards including the 2008 DARPA Young Faculty Award, the 2011 Air Force Office of Scientific Research Young Investigator Award, the 2012 Office of Naval Research Young Investigator Award, the 2012 ASME Bergles-Rohsenow Young Investigator Award in Heat Transfer, as well as best paper awards at 2010 ITherm and 2012 ASME Micro and Nanoscale Heat and Mass Transfer International Conference.