Journal of Textile Research ›› 2019, Vol. 40 ›› Issue (8): 175-180.doi: 10.13475/j.fzxb.20180806806

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Numerical calculation and analysis of three-dimensional flow field in melt-blown process

JI Changchun1,2, ZHANG Kaiyuan1, WANG Yudong1(), WANG Xinhou3   

  1. 1. College of Textile Engineering, Taiyuan University of Technology, Jinzhong, Shanxi 030600, China
    2. Shanxi Institute of Energy, Jinzhong, Shanxi 030600, China
    3. College of Textiles,Donghua University, Shanghai 201620, China
  • Received:2018-08-27 Revised:2019-03-13 Online:2019-08-15 Published:2019-08-16
  • Contact: WANG Yudong E-mail:wydbang@163.com

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Abstract:

In order to study the influence of the end face of the gas-slot in the melt-blown die on the air flow field and the fiber drawing process, a three-dimensional flow field was numerically analyzed. The structural model of the slot die was established by Gambit. The Fluent software was adopted to numerically calculate the three-dimensional flow field from the slot die, and the velocity, temperature and pressure distribution in the flow field were analyzed. The results show that the end face of the gas-slot has a certain influence on the flow field distribution. As the distance from the center of the flow field increases, the velocity and temperature on the spinning line decreases, and the static pressure changes little. The velocity, temperature and pressure distribution on the spinning line near the center of the flow field are very small. The temperature, velocity and static pressure on the spinning line near the end face of thegas-slot are the lowest. The distribution characteristics of the three-dimensional flow field causes differences in fineness and performance of the melt-blown fibers.

Key words: melt-blown process, gas flow die head, three-dimensional flow field, numeral calculation

CLC Number: 

  • TS174.1

Fig.1

Schematic diagram of slot melt-blown die-head. (a) Cross-sectional view of slot die; (b) Top view of slot die"

Fig.2

Computational domain of slot melt-blown die"

Fig.3

Velocity(a), temperature(b) and pressure(c) distribution on xy plane (z=1 mm)"

Fig.4

Velocity(a), temperature(b) and pressure(c) distribution on xy plane (z=5 mm)"

Fig.5

Velocity(a), temperature(b) and pressure(c) distribution on xy plane (z=30 mm)"

Fig.6

Velocity (a), temperature (b) and pressure(c) distribution on xy plane (z=50 mm)"

Fig.7

Velocity distribution on different spinning lines"

Fig.8

Temperature distribution on different spinning lines"

Fig.9

Pressure distribution on different spinning lines"

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