The study of liquid-liquid two-phase flow structure in microchannels is crucial for microreactor devices used in liquid-liquid reactions,extraction,emulsification,and other processes.Focusing on the two-phase immiscible(toluene-water)system,the VOF(volume of fluid)model was selected to numerically simulate the two-phase flow field characteristics in a Y-shaped rectangular microchannel with a three-dimensional diagonal ridge and internal rib structure.The influencing factors included the two-phase inlet flow ratio and the geometrical structure parameters of the ridges.The results indicate that as the flow ratio Qt/Qw increases within the range of 0.24-1.00,a uniform slug flow structure gradually forms in the microchannel and maintains a stable state with the fluid flow.Additionally,when the flow ratio is consistent,and the number of oblique ridges is N=3,arranged on different sides,the overall amplitude change of the dispersed phase slug formed in the microchannel L and the spacing between adjacent slugs l decreases.This improves the stability of the flow field state in the microchannel.The findings offer valuable insights for optimizing and controlling the process parameters of chemical synthesis and preparation of microchannels.
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