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Research Papers: Flows in Complex Systems

A Numerical and Experimental Study on the Effect of the Cone Angle of the Spindle in Murata Vortex Spinning Machine

[+] Author and Article Information
Huifen Guo, Xianglong An, Zhaosheng Yu

College of Textiles, Donghua University, Shanghai 201620, P. R. China

Chongwen Yu1

College of Textiles, Donghua University, Shanghai 201620, P. R. Chinayucw@dhu.edu.en

1

Corresponding author.

J. Fluids Eng 130(3), 031106 (Mar 11, 2008) (5 pages) doi:10.1115/1.2844582 History: Received March 29, 2007; Revised November 28, 2007; Published March 11, 2008

To study the effect of the cone angle of the hollow spindle in the nozzle of Murata vortex spinning (MVS) on yarn properties, the kε turbulence model is employed to simulate the airflow patterns inside the different nozzles with different spindle cone angles. A set of corresponding spinning experiments is designed to verify numerical predictions. The simulation results show that some factors, such as the counter-rotating vortex pair (CVP) over the spindle, high supersonic zone in the inlet of the swirling chamber, and the distribution of wall shear stress (WSS) along the outer wall of the spindle caused by variation of the cone angle of the spindle, are significantly related to fluid flow, and consequently to MVS yarn properties. A rational cone angle (Case 2) can form an axisymmetric CVP and high WSS, which can ensure sufficient twisting of the yarn and produce high quality yarn. The experimental results, which yarn properties spun using 100% cotton, 100% polyester, and polyester 70∕cotton 30 blends with different nozzles, are well consistent with the numerical study.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

The longitudinal sectional profile of the nozzle structures, in order from left to right: Cases 1, 2, and 3

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Figure 2

The grid structures in three cases, in order from left to right: Cases 1, 2, and 3

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Figure 3

Contour plots of streamline in three cases, in order from left to right: Cases 1, 2, and 3

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Figure 4

Distributions of the axial velocities at different locations for three cases. For convenience to compare, a coordinate transformation is done to axial velocity at Section D-D in Case 2, but its magnitude keeps constant.

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Figure 5

The distributions of wall shear stress along the outer wall of the hollow spindle in three cases

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