Analysis of Gas⁃Liquid Two⁃phase Flow Field of 4WS Rotor Internal Mixer

doi:10.19491/j.issn.1001-9278.2021.03.010

Abstract

Abstract:

A transient calculation method and a slip grid technique were employed to compare and analyze the full filling condition of flow field and the gas-liquid two-phase condition of 4WS mixer. The maximum velocity and shear rate of the flow field were found to be located at the top of the rotor edge in the full filling condition. Meanwhile， the maximum positive and negative pressures were located at the rotor propulsion area and the back pressure area， respectively. There was almost no diffusion flow in the gas-liquid two-phase condition when rubber flowed out of the mixing chamber on both sides. The position at maximum velocity and shear rate was not only located at the top of the rotor edge but also at the intersection interface between the rubber phase and air in the mixing chamber on both sides. The mixing index of the rubber group in the left and right mixing Chambers was relatively high. However， there was no obvious distribution law observed.

Key words: internal mixer, gas-liquid two-phase, comparative analysis, mixing index, shear rate

CLC Number:

TQ320.5

HAN Bohong, HE Yandong. Analysis of Gas⁃Liquid Two⁃phase Flow Field of 4WS Rotor Internal Mixer[J]. China Plastics, 2021, 35(3): 67-73.

Figures/Tables 13

Fig.1. Flow field mesh model

Fig.2. Schematic diagram of the rotor section

Fig.3. Initial position of the rubber

Fig.4. Diagram of phase volume fractions of different cross?sections at different moments

Fig.5. Volume fraction of different cross sections of the chamber

Fig.6. Pressure diagram of each section for 1 s under gas?liquid two phase

Fig.7. Pressure diagram of each cross?section for 1 s under full filling

Fig.8. Velocity diagram of each section for 1s under gas?liquid two phase

Fig.9. Velocity diagram of each cross?section for 1 s under full filling

Fig.10. Shear rate neaps of various sections for 1 s under gas?liquid two?phase

Fig.11. Shear rate diagram of each cross?section for 1 s under full filling

Fig.12. Diagram of mixed exponent of each section for 1 s under gas?liquid two phase

Fig.13. Mixing index diagram for each cross?section for 1 s under full filling

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