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首页> 外文期刊>International Journal of Multiphase Flow >Effects of T-junction size on bubble generation and flow instability for two-phase flows in circular microchannels
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Effects of T-junction size on bubble generation and flow instability for two-phase flows in circular microchannels

机译：T型结尺寸对圆形微通道中两相流气泡产生和流动不稳定性的影响

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摘要

A visualization experiment was conducted to detect the effects of the T-junction size on bubble generation and air-water two-phase flow instability in circular microchannels. Four test channels were prepared by connecting two glass capillaries (I.D.: 0.486. mm) in a connecting chamber, and the gaps between the capillaries (0.14-0.25. mm) were used as air injectors. The bubble generation and two-phase flow downstream of the T-junctions were visualized using a high-speed camera. The bubble and slug lengths and bubble generation frequencies were measured from the obtained images. We confirmed that the bubble length can be predicted by a correlation derived from a scaling analysis. However, the correlation was invalid when the flow rate ratio of the two phases was either extremely high or extremely low, or when the bubbles were generated from the smallest T-junction. These flows were defined as unstable or quasi-stable flow, and the transition mechanism to these flows were investigated by analyzing the fluctuations in the Laplace pressure and water phase during the bubble generation process. The time lag in the pressure changes between the Laplace pressure and the water phase destabilizes the flow, and the destabilization increases for small T-junctions and high water velocities.
机译：进行了可视化实验，以检测T型结尺寸对圆形微通道中气泡生成和气水两相流不稳定性的影响。通过在连接室内连接两个玻璃毛细管（内径：0.486。mm）来制备四个测试通道，并将毛细管之间的间隙（0.14-0.25。mm）用作空气注射器。使用高速摄像机观察T形接头下游的气泡生成和两相流动。从获得的图像测量气泡和团块的长度以及气泡产生的频率。我们证实气泡长度可以通过比例分析得出的相关性来预测。但是，当两相的流量比过高或过低时，或从最小的T型结产生气泡时，相关性均无效。这些流动被定义为不稳定或准稳定的流动，并且通过分析气泡产生过程中拉普拉斯压力和水相的波动来研究这些流动的过渡机理。拉普拉斯压力和水相之间的压力变化的时间滞后使流量不稳定，并且对于较小的T型接头和较高的水流速度，不稳定会增加。

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