Surface Structure Enhanced Microchannel Flow Boiling

Author:

Zhu Yangying1,Antao Dion S.1,Chu Kuang-Han1,Chen Siyu1,Hendricks Terry J.2,Zhang Tiejun3,Wang Evelyn N.1

Affiliation:

1. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139 e-mail:

2. NASA/Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 e-mail:

3. Department of Mechanical and Materials Engineering, Masdar Institute of Science and Technology, Building 1A, P.O. Box 54224, Abu Dhabi, UAE e-mail:

Abstract

We investigated the role of surface microstructures in two-phase microchannels on suppressing flow instabilities and enhancing heat transfer. We designed and fabricated microchannels with well-defined silicon micropillar arrays on the bottom heated microchannel wall to promote capillary flow for thin film evaporation while facilitating nucleation only from the sidewalls. Our experimental results show significantly reduced temperature and pressure drop fluctuation especially at high heat fluxes. A critical heat flux (CHF) of 969 W/cm2 was achieved with a structured surface, a 57% enhancement compared to a smooth surface. We explain the experimental trends for the CHF enhancement with a liquid wicking model. The results suggest that capillary flow can be maximized to enhance heat transfer via optimizing the microstructure geometry for the development of high performance two-phase microchannel heat sinks.

Funder

Battelle

Singapore-MIT Alliance for Research and Technology Centre

Office of Naval Research

Air Force Office of Scientific Research

Masdar Institute of Science and Technology

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

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