Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (07): 29-34.doi: 10.13475/j.fzxb.20190703106

• Fiber Materials • Previous Articles     Next Articles

Modeling and simulation of cotton micronaire value based on ANSYS CFX

ZHANG Mengyang1, CHEN Xiaochuan1(), WANG Jun2, LI Yong3   

  1. 1. College of Mechanical Engineering, Donghua University, Shanghai 201620, China
    2. College of Textiles, Donghua University, Shanghai 201620, China
    3. College of Mechanical and Electronic Engineering, Tarim University, Alar, Xinjiang 843300, China
  • Received:2019-07-08 Revised:2019-11-28 Online:2020-07-15 Published:2020-07-23
  • Contact: CHEN Xiaochuan E-mail:xcchen@dhu.edu.cn

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Abstract:

In order to explore the causes for the disorder between cotton fiber micronaire value and cotton fiber quality, the working principle equation of cotton fiber airflow meter was deduced by taking the average diameter and maturity of cotton fiber as independent variables. Firstly, the flow rate of cotton fiber sample and micronaire value was measured under the condition of equal pressure and density, followed by the measurement of the fineness and maturity of six different types of cotton fiber sample using mid-section weighing method and microscopy method respectively. The values were compared with the flow rate calculated using the equation. The results show that the flow through the air inlet is approximately proportional to the square of the product of maturity and diameter of cotton fibers under a constant pressure difference. The permeability model of cotton fibers was constructed by imitating the structure of cotton fibers. According to diameter and maturity, the simulation was carried out by using ANSYS CFX simulation software. The maximum relative error between simulated and experimental results is 7.92%, which proves the validity of the model. It lays a foundation for modifying the Kozeny-Carman constant of cotton fibers and for improving the accuracy of calculation.

Key words: cotton fiber, micronaire value, average diameter, maturity, ANSYS CFX simulation

CLC Number: 

  • TS117

Tab.1

Data for measuring cotton fibers"

棉样
编号		 马克隆值 体积流量/
(L·min-1)		 线密度/
mtex		 成熟
度比		 成熟度
1# 4.12 3.42 208.69 0.74 0.43
2# 4.98 4.51 196.89 1.09 0.63
3# 4.83 4.17 230.83 0.83 0.48
4# 4.02 3.42 204.13 0.74 0.43
5# 4.46 3.83 185.02 0.95 0.55
6# 4.89 4.31 229.64 0.80 0.46

Tab.2

Calculated and experimentally measured flow rates and their relative errors"

棉样
编号		 流量/(10-6 kg·s-1) 相对
误差/%
计算值 实验值
1# 73.49 68.74 -6.92
2# 98.55 90.63 -8.74
3# 85.98 83.70 -2.72
4# 66.40 68.74 3.40
5# 79.26 76.87 -3.12
6# 80.81 86.46 6.53

Fig.1

Modeling process of permeability model of cotton fibers"

Tab.3

Data of fluid modeling"

棉样编号 直径/μm 体积/(10-6cm3)
1# 20.63 11.85
2# 16.28 14.28
3# 20.11 12.60
4# 19.78 11.78
5# 16.79 13.50
6# 20.20 12.35

Fig.2

Fluid model of cotton sample 1#"

Fig.3

Cotton sample 1# simulated pressure cloud picture"

Tab.4

Computational flow and relative errors"

棉样编号 流量/(10-10 kg·s-1) 仿真流量
相对误差/%
实验值 仿真值
1# 68.74 68.91 -0.25
2# 90.63 97.80 -7.92
3# 83.70 83.84 -0.17
4# 68.74 64.78 5.75
5# 76.87 78.44 -2.04
6# 86.46 83.84 3.03
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