Analysis Of Mixing Mechanism Based On Gas-Liquid Two-Phase Flow Confinement Machine

As the key equipment for polymer compounding,the compactor is widely used in the production of polymers.In the actual production process,it is often not possible to completely fill the refining chamber with rubber,and when the internal air phase is mixed,the velocity and pressure of the rubber in the flow field cannot be directly transferred,so there are certain differences in the analysis of the fully filled and gas-liquid two-phase flow fields.In this paper,we abandon the previous assumption of full-filled flow field and use VOF method to realize the numerical simulation of two-dimensional and three-dimensional flow field of gas-liquid two-phase flow in 4WS type rotor refiner,analyze the velocity,pressure,shear rate and mixing index of the flow field inside the refiner,and propose the rotor optimization idea to improve the mixing efficiency of the flow field.The main research aspects of this paper are as follows.(1)Using Ansys DM software and Pro/E software to draw two-dimensional model and rotor three-dimensional model respectively,the flow field model is established by Ansys DM software,using Boolean on the difference operation to separate the flow field,and the flow field is decomposed into dynamic and static flow field.Boundary conditions were set: UDF + dynamic mesh method was used for the 2D model simulation,and slip mesh method was used for the 3D model simulation.The velocity and pressure are briefly analyzed for the post-processing of the 2D flow field,and the velocity,pressure,shear rate and mixing index distribution are analyzed in detail for the 3D flow field.(2)The cloud diagrams of the volume fraction distribution and the velocity and pressure distribution of the two-dimensional flow field under three working conditions were analyzed to obtain the flow state of the rubber phase inside the refining chamber within 1s,and the distribution law of the pressure and velocity in the flow field.(3)The velocity,pressure,shear rate and mixing index cloud distribution of the 75% filling rate of the rubber phase in the refining chamber under different working conditions,different moments and different cross-sections were demonstrated by establishing the equivalent surface,and the transient curves of velocity,pressure and shear rate of the rubber phase volume fraction greater than 0.9 at fixed points in the flow field were obtained to analyze the axial distribution law of the rubber phase in the three-dimensional refining chamber.Translated with www.Deep L.com/Translator(free version)(4)The comparative analysis of 60%,75% and 85% filling rate of rubber in the refining chamber with full filling at 1s under the same speed condition,and the same and different points of velocity,pressure,shear rate and mixing index distribution in the flow field under full filling and gas-liquid two-phase conditions were obtained.