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首页> 外文会议>4th International Conference on Nanochannels, Microchannels and Minichannels 2006(ICNMM2006) pt.B >OPTICAL MEASUREMENT OF VOID FRACTION AND BUBBLE SIZE DISTRIBUTIONS IN A MICROCHANNEL
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OPTICAL MEASUREMENT OF VOID FRACTION AND BUBBLE SIZE DISTRIBUTIONS IN A MICROCHANNEL

机译：微通道中空隙率和气泡大小分布的光学测量

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摘要

An optical measurement system was developed to investigate gas-liquid two-phase flow characteristics in a circular microchannel of 100 μm diameter. By using multiple optical fibers and infrared photodiodes, void fraction and gas plug and liquid plug lengths, and their velocities were measured successfully. The probes responded to the passage of gas and liquid phases through the microchannel adequately so that the time-average void fraction could be obtained from the time fraction for each phase. Also, by cross-correlating the signals from two neighboring probes, the interface velocity representing gas plug velocity or ring-film propagation velocity depending on the flow pattern could be computed. Within the ranges of superficial gas and liquid velocities covered in the experiments (j_L= 0.2～0.4 m/s and j_G = 0 ～ 5 m/s), the gas plug length was found to increase with the increasing superficial gas velocity, but the liquid plug length was found to decrease sharply as the superficial gas velocity was increased, so that the total length of the gas-liquid plug unit decreased with the superficial gas velocity.
机译：开发了一种光学测量系统，以研究直径为100μm的圆形微通道中的气液两相流动特性。通过使用多根光纤和红外光电二极管，成功地测量了空隙率以及气体塞和液体塞的长度以及它们的速度。探针对气相和液相通过微通道的反应作出了充分的响应，因此可以从每个相的时间分数中获得时间平均空隙分数。同样，通过互相关来自两个相邻探针的信号，可以计算出代表流速的界面速度，该界面速度代表气塞速度或环膜传播速度。在实验覆盖的表观气液速度范围内（j_L = 0.2〜0.4 m / s，j_G = 0〜5 m / s），随着表观气速的增加，气塞长度增加。发现随着表面气体速度的增加，液体塞的长度急剧减小，因此气液塞单元的总长度随着表面气体的速度而减小。

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