Numerical Simulation of Polyacrylonitrile Gel Flow Characteristics in Laminated Runner

doi:10.19491/j.issn.1001-9278.2021.07.013

Abstract

Abstract:

A 3D and finite element mesh model of flow channel was established， and then Polymat was used to fit the parameters of the material according to the rheological test results. The Polyflow software was used to analyze the numerical simulation of the 3D isothermal flow process of polyacrylonitrile gel in a channel. The results indicated that the outlet velocity of the channel was more uneven as the inlet flow increased. The pressure in the channel gradually decreased along the flow direction and decreases down to the same minimum value at the outlet. The inlet and outlet pressure difference of the channel has a positive correlation with the inlet flow rate. The shear rate was uniformly distributed on the central section of the channel under a small fluctuation range.

Key words: polyacrylonitrile, precursor, gel, microlayer co?extrusion, Polyflow software, numerical simulation

CLC Number:

TQ325.8

SHENG Tianyang, TAN Jing, ZHANG Zhenghe, GAO Xiaodong, YU Jingchao, CHENG Lisheng, YANG Weimin. Numerical Simulation of Polyacrylonitrile Gel Flow Characteristics in Laminated Runner[J]. China Plastics, 2021, 35(7): 74-79.

Figures/Tables 11

Fig.1. Geometry model and size parameters of the runner

Fig.2. Finite element mesh model

Fig.3. Viscosity?shear rate curve of the gel

n	λ/s	η₀/Pa·s	η_∞/Pa·s
3.7×10^-7	5.2×10^-2	77.6	1.5×10^-5

Tab.1. Material parameters

Fig.4. Cloud diagram of velocity distribution in the runner at different inlet flows

Fig.5. Curve of cross?sectional area along the flow direction

Fig.6. Velocity distribution of each layer in the runner under different inlet flow

Fig.7. Cloud diagram of pressure distribution in runner at different inlet flow

Fig.8. Pressure difference in the runner at different inlet flow

Fig.9. Schematic diagram of the position on the center section in the runner

Fig.10. Cloud diagram of shear rate distribution in the central section of the runner at different inlet flow

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