University of California, Riverside

Department of Electrical and Computer Engineering



Colloquium Speaker: Professor Renkun Chen presents a talk on


Colloquium Speaker: Professor Renkun Chen presents a talk on
 
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Colloquium Speaker: Professor Renkun Chen presents a talk on

October 16, 2017 - 11:10 am
Winston Chung Hall, 205/206

ABSTRACT

The trend of continuous miniaturization of electronic and optoelectronic devices poses twochallenges for thermal management: (1) when the size of a material is shrunk into thenanometer scale, its thermal transport properties, including thermal conductivity andinterfacial thermal resistance, could behave drastically different compared to their bulkcounterparts. (2) the miniaturization is often accompanied with increasing power density,especially in high-power devices, such as laser diodes and high electron mobility transistors.The ultra-high heat flux, which often exceeds 1 Kilowatt per square centimeter, or equivalentto 10,000 suns, has become one of the bottlenecks of continuous scaling of these devices.In this talk, I will present work being conducted in my group aiming to address these twoproblems. Specifically, we study thermal transport properties in crystalline and amorphous Sinanostructures, and show that these structures possess unusual size dependent thermaltransport properties at nanoscale, which are unexpected from conventional theoreticalunderstanding. We also show a new phase change heat transfer mechanism that exploits thelarge latent heat associated with vaporization of liquid to achieve a record-high heatdissipation capability (>1 Kilowatt per square centimeter). This mechanism is enabled bynanostructured surface and is approaching the theoretical limit of liquid-vapor phase changeheat transfer.

BIOGRAPHY

Renkun Chen is Associate Professor at the University of California, San Diego. He receivedhis B.S. degree in Engineering Thermo-physics from Tsinghua University in 2004, and Ph.D.degree in Mechanical Engineering from the University of California, Berkeley in 2008.Following a one-year stint as a postdoctoral fellow at Lawrence Berkeley National Laboratory,he joined the faculty of UC San Diego in the Department of Mechanical and AerospaceEngineering in 2009. His research group is interested in fundamental nanoscale heat transferas well as engineering applications of nanotechnology in thermal transport and management.

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University of California, Riverside
900 University Ave.
Riverside, CA 92521
Tel: (951) 827-1012

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Electrical and Computer Engineering
Suite 343 Winston Chung Hall
University of California, Riverside
Riverside, CA 92521-0429

Tel: (951) 827-2484
Fax: (951) 827-2425
E-mail: E-mail/Questions

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