Mixing mass transfer mechanism and dynamic control of gas-liquid-solid multiphase flow based on VOF-DEM coupling

Mixing mass transfer process of the gas-liquid-solid multiphase flow is a crucial manufacturing technology in some industrial applications, such as the material mixing of the high-end chemical industry and the lithium electric homogenate dispersion of the new energy. The complicated multiphase mass transfer mechanism is a fluid-structure coupling mechanic problem with intensive shear and nonlinear characteristics, making the flow field face challenges in regulating. Here, a fluid-structure coupling-based mechanic model is set up based on the coupled volume-of-fluid and discrete element model (VOF-DEM) to explore the multiphase mixing mass transfer mechanism. A porous interphase optimization and dynamic mesh technique are proposed to reveal flow pattern regularities under the inflating disturbance. Then, an experimental observation platform is built, and the fractal geometric analysis method is utilized to reveal the chaotic evolution property. Research results illustrate that the presented modelling method can well obtain the multiphase mixing mass transfer regularities. The appropriate inflation rate can improve particle suspension effects, and promote interphase mixing mass transfer, and achieve the dynamic control of the multiphase flow filed. The results can provide a valuable reference for mass transfer and flow pattern identification and support technical support for lithium electric homogenate mixing and chemical extraction.