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ISSN Online: 2379-1748

ISBN Flash Drive: 978-1-56700-431-1

ISBN Online: 978-1-56700-430-4

First Thermal and Fluids Engineering Summer Conference
August, 9-12, 2015 , New York City, USA

NUCLEATE BOILING HEAT TRANSFER ENHANCEMENT WITH ELECTROWETTING

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DOI: 10.1615/TFESC1.mnt.012859

要約

Electrowetting (EW) has drawn significant research interests in droplet-based microfluidics, and most applications focus on electronic displays, lab-on-a-chip devices and electro-optical switches, etc. In this paper, we report a novel application of EW in enhancing nucleate boiling heat transfer. The working approach capitalizes on the complimentary roles of hydrophobicity and hydrophilicity in the fundamental processes of nucleate boiling, and takes advantage of the ability of EW to dynamically alter the surface wettability at different thermal loads. In this work, we demonstrate the creation of tunable adaptive boiling surfaces, and examine the effects of EW on the overall boiling heat transfer characteristics. A synchronized high-speed optical imaging and infrared thermography approach is taken to obtain simultaneous measurements of the bubble dynamics, the temperature and heat flux distributions on the boiling surface. Boiling curves are constructed and the boiling heat transfer coefficients are computed for EW-modulated surfaces, and the comparison with that for the baseline hydrophobic surface shows clearly the efficacy of using alternating current (AC) EW to drastically improve the boiling heat transfer performance. Some insights are also offered on the boiling heat transfer mechanisms under the influence of EW.