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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Bubble generation and transport in a microfluidic device with high aspect ratio
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Bubble generation and transport in a microfluidic device with high aspect ratio

机译：高纵横比的微流控设备中气泡的产生和传输

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摘要

Bubble generation and transport in a micro-device composed of a micro-T-junction and a following serpentine micro-channel was experimentally investigated. It has a rectangular cross-sectional with an aspect ratio of 7.425. Air and water were used as gas and liquid, respectively. Mixtures of water-glycerol and water-Tween-20 were used to study the effects of liquid viscosity and surface tension. Compared with previous T-junction bubble generation, the liquid and gas inlets orientation was switched in this work. The continuous flow was driven from the perpendicular channel and the dispersion flow was from the main channel. It shows that the break-up process has three periodic steps under certain operating conditions. The dimensionless bubble length L/w in the micro-channel with high aspect ratio is much larger than that in square microchannels. A correlation is proposed to correlate L/w with liquid flow rate J(L), gas flow rate J(G), and liquid Viscosity mu(L). Surface tension sigma can change the bubble shape but almost does not affect the bubble length in this fast break-up process. Additionally, a long bubble may be broken up at the corners at the same time because the locations of gas and liquid are exchanged relative to the concave and convex portions of an elbow after a turn which may result in the change of fluid velocities and gas-liquid pressure drop.
机译：实验研究了在由微型T型结和随后的蛇形微通道组成的微型设备中气泡的产生和运输。它具有矩形截面，长宽比为7.425。空气和水分别用作气体和液体。使用水-甘油和水-Tween-20的混合物来研究液体粘度和表面张力的影响。与以前的T型结气泡产生相比，在这项工作中改变了液体和气体入口的方向。从垂直通道驱动连续流，而从主通道驱动分散流。它表明，在某些操作条件下，分解过程具有三个周期性步骤。高纵横比的微通道中的无量纲气泡长度L / w比方形微通道中的无量纲气泡长度L / w大得多。提出了一种将L / w与液体流量J（L），气体流量J（G）和液体粘度mu（L）相关的相关性。在这种快速破碎过程中，表面张力sigma可以改变气泡的形状，但几乎不影响气泡的长度。此外，长的气泡可能同时在拐角处破裂，因为转弯后气体和液体的位置相对于弯头的凹凸部分进行了交换，这可能导致流体速度和气体的变化。液体压力下降。

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