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首页> 外文期刊>International Journal of Heat and Mass Transfer >Boiling instability in parallel silicon microchannels at different heat flux
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Boiling instability in parallel silicon microchannels at different heat flux

机译：平行硅微通道在不同热通量下的沸腾不稳定性

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摘要

In this paper, a series of experiments have been carried out to study different boiling instability modes of water flowing in microchannels at various heat flux and mass flux with the outlet of the channels at atmospheric pressure. Eight parallel silicon microchannels, with an identical trapezoidal cross-section having a hydraulic diameter of 186 μm and a length of 30 mm, were used in this experiment. When the wall heat flux was increased from 13.5 to 22.6 W/cm{sup}2 and the time average mass flux of water was decreased from 14.6 to 11.2 g/cm{sup}2 s, three kinds of unstable boiling modes were observed in the microchannels. These were (1) the liquid/two-phase alternating flow (LTAF) at low heat flux and high mass flux, (2) the continuous two-phase flow (CTF) at medium heat flux and medium mass flux, and (3) the liquid/two-phase/vapor alternating flow (LTVAF) at high heat flux and low mass flux. Simultaneously, periodic oscillations of wall temperature, inlet and outlet water temperatures and pressures, and instantaneous mass flux were measured. Among the three unstable boiling modes, oscillation amplitudes in LTVAF were the largest with oscillations of pressures and mass flux nearly out of phase. Oscillation amplitudes in CTF were the smallest with oscillations of pressures and mass flux nearly in phase. Oscillation amplitudes in LTAF lied in between LTVAF and CTF with oscillations of pressures and mass flux nearly out of phase. Also, the oscillation period (including two-phase period, liquid period and vapor period) depends greatly on the amounts of heat flux and mass flux. Bubbly flow and some peculiar two-phase flow patterns were observed in the microchannels during two-phase flow periods.
机译：本文进行了一系列实验，研究了在大气压下，在不同热通量和质量通量下，在微通道中流动的水的不同沸腾不稳定性模式。在该实验中使用了八个平行的硅微通道，它们具有相同的梯形横截面，水力直径为186μm，长度为30 mm。当壁热通量从13.5 W / cm {sup} 2增加到22.6 W / cm {sup} 2时，水的平均质量通量从14.6 g / cm {sup} 2 s降低到11.2 g / cm {sup} 2 s，观察到三种不稳定的沸腾模式。微通道。它们是（1）在低热通量和高质量通量下的液相/两相交流流（LTAF），（2）在中等热通量和中等质量通量下的连续两相流（CTF），以及（3）在高热通量和低质量通量下的液相/两相/蒸气交替流（LTVAF）。同时，测量了壁温，进水和出水温度和压力以及瞬时质量通量的周期性振荡。在这三种不稳定的沸腾模式中，LTVAF的振荡幅度最大，压力和质量通量的振荡几乎异相。 CTF的振荡幅度最小，压力和质量通量的振荡几乎同相。 LTAF的振荡幅度位于LTVAF和CTF之间，压力和质量通量的振荡几乎异相。而且，振荡周期（包括两相周期，液相周期和蒸气周期）在很大程度上取决于热通量和质量通量。在两相流期间，在微通道中观察到气泡流和一些特殊的两相流模式。

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