Effects of the Velocity Fluctuations on Two-Phase Pressure Drop in Microchannels
Effects of the Velocity Fluctuations on Two-Phase Pressure Drop in Microchannels
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发表时间：
2013-04
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通讯作者：
Ken Yamamoto;S. Ogata
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作者：
Ken Yamamoto;S. Ogata
对直径为486 mm的圆形微通道内的水-空气弹状流进行了可视化和压降测量。在测试段中制造了不同尺寸的T形接头（136、194和252微米），以研究气泡产生过程对压降的影响。从可视化中可以看出，由气泡产生引起的速度波动的幅度随着流量比Q空气/Q水增加到平均速度的约45%。虽然没有观察到的依赖性的速度波动幅度上的T形接头的大小，它被发现，大的速度波动增加的压降从其预测值。当速度波动幅度增加到45%时，与预测模型的偏差达到约30%。
Visualization and pressure drop measurements of water–air slug flows in circular microchannels ( d = 486 mm) were conducted. Various sizes of T-junction (136, 194, and 252 micrometer) were fabricated in the test section, in order to investigate the effects of bubble generation process on the pressure drop. It was revealed from the visualization that the amplitude of velocity fluctuations, which is induced by the bubble generation, increased up to approximately 45% of the mean velocity with flow rate ratio Q air /Q water . Although the dependency of the velocity fluctuation amplitude on the T-junction size was not observed, it was found that large velocity fluctuations increases the pressure drop from its predictive value. The deviation from the predictive model reached approximately 30% when the velocity fluctuation amplitude was increased to 45%.