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International Heat Transfer Conference 13

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

PHASE-CHANGE HEAT TRANSFER IN MICROSYSTEMS

Ping Cheng
Mechanical Engineering Department, The Hong Kong University of Science and Technology; MOE Key Laboratory for Power Machinery and Engineering, School of Mechanical and Power Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China

Hui Ying Wu
Shanghai Jiaotong University, Shanghai, P. R. CHINA

DOI: 10.1615/IHTC13.p30.20
23 pages

Abstract

Recent work on phase-change heat transfer in microsystems, including flow boiling and condensation in microchannnels as well as bubble growth and collapse on microheaters, is reviewed. For flow boiling in microchannels, it was found that single-phase and two-phase alternating flows with large fluctuation of pressure and temperature existed in microchannels at low mass fluxes with a high degree of inlet subcooling. For flow condensation in microchannels, droplet flow, annular flow, injection flow, and slug-bubbly flow exist in the microchannels, depending on mass flux and quality. The breakup of the annular two-phase flow into slug-bubbly flow during condensation flow in microchannels is clearly shown in a visualization study. Effects of pulse heating widths, heater size and fluid viscosity on bubble growth and collapse on microheaters and its nucleation temperature are discussed.

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Measurement of fluid temperature with an arrangement of three thermocouples