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Define viscosity of a fluid7/7/2023 Although there have been many developments in the flow of viscous ionic liquids in microchannels, the flow phenomenon in microchannels under a high viscosity ratio of more than 100 was rarely studied. 29 dispersed into plugs to enhance the extraction performance of ionic liquids. 28 chose and the solution of glycerol in de-ionized water as the two-phase system and investigated the mechanism of core-annular flow in a flow-focusing device. Then, the effect of the cross section aspect ratios on the flow was also investigated. Different types of annular flow were observed under large flow rates. Tsaoulidis et al., 26 studied the two-phase flow law of and water in a hydrophilic glass T-junction channel. 22 Due to the superior reaction and dissolution properties, 23–25 it has great potential to be selected as a reagent for microfluidic, which will also lead to a large viscosity difference between components. However, the reagents used in the actual processes usually have a wide range of physical properties, e.g., for the ionic liquid system, its viscosity can be up to O(10 3) at room temperature. We further investigate the effect of high viscosity ratios on the dispersion process, revealing that the substantial increase in terms of the viscosity ratio of fluids leads to the enhancement of continuous phase viscous shear and dispersed phase inertia effect, which would bring the deviation of the operating range from mostly reported flow systems. The results are in good agreement with the experiments in the literature. Using this model, we successfully simulate the droplet formation process of fluids with a high viscosity ratio in the common T-junction channel. By taking several static and dynamic cases, we prove that this model could accurately describe interfacial tension, wettability, and flow problems in two-phase flows with a low spurious velocity at the range of viscosity ratio up to O(10 3). The regularized method is incorporated in this MRT framework to deal with the high viscosity ratio problems involving practical inlet–outlet boundaries.
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