Numerical simulation of extrusion flow process of natural polymers in laminated flow channels

doi:10.19491/j.issn.1001-9278.2023.01.010

Abstract

Abstract:

To explore the extrusion flow process and mixing characteristics of natural polymers in the stacked flow channel， a three⁃dimensional physical model and a finite element mesh model of the stacked flow channel were established. The POLYFLOW software was used to calculate the flow rate of the food melt and the distributions of pressure， velocity， and shear rate during the extrusion process. The results indicated that the pressure decreased in a gradient along the extrusion direction， and the pressure difference at the middle position increased with an increase in the inlet flow rate. There is a significant change in shear rate in the flow channel. The shear rate tended to decrease from the middle position of the flow channel to the periphery and from the wall surface to the surrounding area. The speed increased at first and then decreased along the extrusion direction in the flow channel. The speed presented a small value near the wall surface. The structure and size design of the stacked twist flow channel can help to improve the mixing effect of natural polymers. The mixing effect in the 1^st and 4^th layer runners was better than that in the 2^nd and 3^rd layer runners. An increase in the inlet flow was also beneficial to the improvement of mixing effect.

Key words: food extrusion, laminated runner, Polyflow software, numerical simulation

CLC Number:

TQ320.66

WANG Dejian, YU Pengfei, DING Yumei, YANG Weimin. Numerical simulation of extrusion flow process of natural polymers in laminated flow channels[J]. China Plastics, 2023, 37(1): 60-65.

Figures/Tables 11

Fig.1. Three⁃dimensional geometric model of laminated runner

Fig.2. Finite element mesh model

Fig.3. Cloud map of down⁃pressure distribution at different flow rates

Fig.4. Pressure change curve of each layer under Q1 flow rate

Fig.5. Change curve of layer 1 flow channel pressure under different inlet flow rate

Fig.6. Cloud diagram of thickness distribution

Fig.7. Change curve of flow channel cross⁃section area along the flow direction

Fig.8. Schematic diagram of the center cross⁃section

Fig.9. Cloud map of the central cross⁃section shear rate under Q1 flow rate

Fig.10. Cloud map of shear rates under different flow rates

Fig.11. Cloud map of the center section of the flow channel under different flow rates

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