Effect of Pulse Width and Mass Flux on Microscale Flow Boiling

Abstract

Abstract:The investigation on microscale flow boiling of subcooled water was carried out based on the microchip fabricated by MEMS technology. The effects of pulse width and mass flux on boiling inception were analyzed. A Pt microheater (140 μm×100 μm) was used in this experiment. Six pulse widths (0.05, 0.10, 0.20, 0.60, 1.00 and 2.00 ms) and five mass fluxes (45, 90, 135, 180 and 225 kg/(m3·s)) were chosen during experiment. It is found that either pulse width or mass flux has little effect on boiling inception time. An expression which for the transition heat flux of boiling regimes under different pulse width fits well with experimental data is obtained. A most effective pulse width is obtained through the analysis on nondimensional boiling inception time.

Key words:microscale,boiling,pulse heating,pulse width,inception time

CLC Number:

TB65

CHEN Gang, QUAN Xiao-Jun, ZHENG Ping. Effect of Pulse Width and Mass Flux on Microscale Flow Boiling[J]. Journal of Shanghai Jiaotong University, 2011, 45(09): 1336-1339.

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