微小流路内における液液スラグ流可視化計測

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  • Visualization measurement of liquid-liquid slug flow in a microchannel

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<p>In recent years, research to improve the efficiency and refinement of chemical reactions has been progressed in the fields of chemistry and engineering. The mixing speed is faster in a microscale flow path than that of the conventional device, due to the mixing of substances is promoted in the microscale flow path. In addition, the fluid is not easily affected by gravity in the microscale flow path. Compared to studies on gas-liquid, solid-liquid, and solid-gas multiphase flows, there are still less research on liquid-liquid two-phase flow. Prediction and control of the slug length of liquid-liquid two-phase slug flow is an important research subject. In the present study, we focused on the characteristics of liquid-liquid slug flow of silicone oil with different viscosity and pure water in a micro-channel. Here, the change of slug length in the micro channel due to the change of viscosity and flow rate of the dispersed phase and continuous phase liquid was measured, and the flow characteristics in the micro-channel was qualitatively evaluated. Liquid-liquid (silicon oil - pure water) mixed flow in a microscale channel was recorded by a high-speed camera, and the slug formation behavior was visualized and measured. The slug length tended to increase with increasing viscosity, weber number, capillary number of the sample liquid.</p>

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