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| Effect of Pulse Width and Mass Flux on Microscale Flow Boiling |
| CHEN Gang, QUAN Xiao-Jun, ZHENG Ping |
| (Key Laboratory for Power Machinery and Engineering of the Ministry of Education,Shanghai Jiaotong University, Shanghai 200240, China) |
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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 nondimensional boiling inception time.
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Received: 19 April 2010
Published: 30 September 2011
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