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Flow Patterns During Flow Boiling Instability in Silicon-Based Pin-Fin Microchannels

[+] Author Affiliations
Fayao Xu, Huiying Wu, Zhenyu Liu

Shanghai Jiao Tong University, Shanghai, China

Paper No. HT2016-7387, pp. V002T08A003; 9 pages
doi:10.1115/HT2016-7387
From:
  • ASME 2016 Heat Transfer Summer Conference collocated with the ASME 2016 Fluids Engineering Division Summer Meeting and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels
  • Volume 2: Heat Transfer in Multiphase Systems; Gas Turbine Heat Transfer; Manufacturing and Materials Processing; Heat Transfer in Electronic Equipment; Heat and Mass Transfer in Biotechnology; Heat Transfer Under Extreme Conditions; Computational Heat Transfer; Heat Transfer Visualization Gallery; General Papers on Heat Transfer; Multiphase Flow and Heat Transfer; Transport Phenomena in Manufacturing and Materials Processing
  • Washington, DC, USA, July 10–14, 2016
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 978-0-7918-5033-6
  • Copyright © 2016 by ASME

abstract

Flow patterns during boiling instability of deionized water across silicon-based microchannels with inner pin-fin arrays have been studied experimentally. Three types of microchannels with different pin-fin structures and a hydraulic diameter of 210 μm were used. During the unstable flow boiling, two types of instability modes of temperature and pressure oscillations occurred: long-period/large-amplitude oscillation mode and short-period/small-amplitude oscillation mode. There were increasing and decreasing stages of the temperature measurement during a period of long-period/large-amplitude oscillation mode. According to visualization observation, in the increasing stage of temperature oscillation for the in-line pin-fin microchannel, four two-phase flow patterns, including bubbly flow, vapor-slug flow, stratified flow, and stream flow, occurred sequentially with time; for the staggered pin-fin microchannels, the four two-phase flow patterns, together with single liquid-phase flow and single vapor-phase flow occurred sequentially with time. The flow pattern transitions were inverse between the increasing and decreasing stages of temperature measurement. Under the short-period/small-amplitude oscillation mode, only the stream flow occurred. With the increase of heat flux, the stream flow and the single vapor-phase flow occupied more and more time ratio during an oscillation period in the in-line and staggered pin-fin microchannels, respectively.

Copyright © 2016 by ASME

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