Simulation analysis of the influence of screw configuration on the flow field of meshing twin screw

doi:10.19491/j.issn.1001-9278.2023.10.018

Abstract

Abstract:

The flow channel distribution of three different screw configurations was discussed by taking polylactic acid （PLA） in a twin⁃screw extruder with different directions at ratios of screw heads to rotor of 2∶2， 3∶2， 4∶2. The 3D models for these three screw configurations were established by the SolidWorks software according to a theoretical end curve equation. The mesh models of the three screw configurations were established using the Workbench software， and the actual flow field was simulated using the Polyflow fluid simulation software to obtain the post⁃processing results. The final result was analyzed by using the FieldView post⁃processing analysis software. The pressure， shear rate， and viscosity of the PLA fluid were studied under different screw configurations. Meanwhile， the residence time distribution curve and distribution mixing characteristics were compared by using the Polystat statistical module. The results indicated that the pressure fluctuation decreased， the shear effect increased， the residence time increased， and the distribution effect increased with an increase in the number of screw heads of the negative rotor at a screw speed of 60 rpm with the certain number of screw heads of the positive rotor. There are advantageous to the output and mixing of materials.

Key words: screw extruder, opposite meshing, number of screw head, numerical simulation, flow field analysis

CLC Number:

TQ320.66⁺3

ZHANG Yiming, HUANG Zhigang, XU Zhen, CHENG Yuanyuan. Simulation analysis of the influence of screw configuration on the flow field of meshing twin screw[J]. China Plastics, 2023, 37(10): 131-138.

Figures/Tables 18

Fig.1. Theoretical end curve with a head ratio of 2∶2

Fig.2. The theoretical end curve with the ratio of 3∶2 to 4∶2

模型名称	阴转子头数	阳转子头数	螺杆长度/mm	螺杆中距/mm	螺杆内径/mm	螺杆外径/mm	螺槽深度/mm	螺杆间距/mm
AC22	2	2	60	30	12	18	6	10
AC32	3	2	60	30	12	18	6	10
AC42	4	2	60	30	12	18	6	10

Tab.1. Screw element modeling parameters

流道长度/mm	流道中心距/mm	流道内径/mm	流道外径/mm
60	31	12	18.5

Tab.2. Channel area modeling parameters

Fig.3. Three dimensional model of twin screw of AC32

Fig.4. Finite element model of screw element and flow channel

螺杆模型

阴转子头数

阳转子头数

阴转子转速/

$r · m i n - 1$

阳转子转速/

$r · m i n - 1$

AC22

AC32

AC42

螺杆模型

阴转子头数

阳转子头数

阴转子转速/

$r · m i n - 1$

阳转子转速/

$r · m i n - 1$

AC22

AC32

AC42

Tab.3. Screw model speed parameters

Fig.5. Pressure cloud diagram for different screw configurations

Fig.6. Axial pressure line diagram

Fig.7. Shear rate nephogram of different screw configurations

Fig.8. Line chart of axial shear rate

Fig.9. Viscosity nephogram for different screw configurations

Fig.10. Line chart of axial viscosity

时间切片序列	双螺杆模型
时间切片序列	AC22	AC32	AC42
Slice 0	2 000	2 000	2 000
Slice 1	1 752	1 696	1 601
Slice 2	1 710	1 625	1 535
Slice 5	1 604	1 512	1 385
Slice 10	1 443	1 269	1 140
Slice 20	1 134	1 007	1 041
Slice 30	963	966	1 012
Slice 45	929	957	1 004
Slice 60	910	956	920

Tab.4. Shows of the distribution of tracer particles

Fig.11. Residence time distribution curves

Fig.12. Distribution exponential curves

Fig.13. Shows of the mixing of tracer particles

Fig.14. Separation scale curves

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