Abstract This work focuses on the formation and uniformity of bubbles in highly viscous fluids in symmetric parallel microchannels by using a high-speed camera. Nitrogen and high viscous glycerol-water solution containing 0.3% SDS are used as the gas and liquid phases respectively. The interface evolution during bubble information is reported. The effects of liquid flow rates, liquid viscosities, gas pressures, and microchannel configurations on bubble size distribution are investigated based on the gas-liquid two-phase flow resistance model. It is found that the difference in the downstream resistance, the pressure fluctuation of the upstream channels, and the feedback effect of bubble behaviors in the cavity affect the uniformity of bubble size. In the configuration that the widths of the microchannels engineered according to Murray's law, the uniformity is better, under low gas pressures, high viscosities and flow rates of liquids. Finally, the prediction models of bubble size in both geometries are proposed.

中文翻译：

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对称平行微通道中高粘度流体中气泡的形成和均匀性

摘要 这项工作的重点是使用高速相机在对称平行微通道中的高粘性流体中气泡的形成和均匀性。分别使用氮气和含有 0.3% SDS 的高粘度甘油-水溶液作为气相和液相。报告了气泡信息期间的界面演变。基于气液两相流阻模型研究了液体流速、液体粘度、气体压力和微通道配置对气泡尺寸分布的影响。发现下游阻力的差异、上游通道的压力波动以及腔内气泡行为的反馈效应影响气泡尺寸的均匀性。在根据默里定律设计的微通道宽度的配置中，在低气压、高粘度和液体流速下，均匀性更好。最后，提出了两种几何形状中气泡尺寸的预测模型。