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Research Papers

Designing the Spindle Parameters of Vortex Spinning by Modeling the Fiber/Air Two-Phase Flow

[+] Author and Article Information
Zeguang Pei

College of Mechanical Engineering,
Donghua University,
Shanghai 201620, China
e-mail: zgpei@dhu.edu.cn

Contributed by the Manufacturing Engineering Division of ASME for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received August 3, 2013; final manuscript received December 24, 2013; published online March 26, 2014. Assoc. Editor: Donggang Yao.

J. Manuf. Sci. Eng 136(3), 031012 (Mar 26, 2014) (9 pages) Paper No: MANU-13-1302; doi: 10.1115/1.4026445 History: Received August 03, 2013; Revised December 24, 2013

Vortex spinning is a novel technology which produces short-staple yarns by utilizing high-speed swirling airflow. The structure of the spindle plays an important role in vortex spinning in terms of its effect on the resulting yarn properties. In this paper, a two-dimensional fluid-structure interaction (FSI) model for the fiber/air two-phase flow is presented to design the two spindle parameters—the spindle cone angle and spindle diameter by evaluating their effects on the fiber dynamics in the flow field inside the twisting system and the resulting yarn tenacity. The coupling between the fiber and airflow is solved and the motional characteristics of the fiber are obtained. It is found that the fiber moves downstream in a varying wavy shape and its spreaded trailing portion is then in a helical motion to form the yarn. The results also show that the increase of the spindle cone angle has a negative effect on the tenacity of the produced vortex yarn. The increased spindle diameter gives rise to the decreased vortex yarn tenacity. The numerical results can provide an explanation for the experimental results reported by previous studies.

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References

Figures

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Fig. 1

Structure of the twisting system and yarn formation process in vortex spinning [3]

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Fig. 2

The geometry of the two-dimensional computational domains of the airflow field and fiber

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Fig. 3

Mesh generated for the computational domain: (a) airflow domain and (b) a close-up view of the mesh near the fiber leading end

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Fig. 4

Simulation result of the fiber dynamics and airflow velocity contours in the twisting system of vortex spinning in case 1: (a) t = 0.0007 s, (b) t = 0.00096 s, (c) t = 0.00126 s, (d) t = 0.00157 s, (e) t = 0.00176 s, (f) t = 0.00195 s, (g) t = 0.00203 s, and (h) t = 0.00217 s

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Fig. 5

High-speed photographic image of the fiber dynamics in the nozzle of vortex spinning

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Fig. 6

Simulation result of the fiber dynamics and airflow velocity contours in the twisting system of vortex spinning in case 2 (α = 20 deg): (a) t = 0.00062 s, (b) t = 0.00086 s, (c) t = 0.00116 s, (d) t = 0.00149 s, (e) t = 0.00163 s, (f) t = 0.00190 s, (g) t = 0.00206 s, and (h) t = 0.00222 s

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Fig. 7

Simulation result of the fiber dynamics and airflow velocity contours in the twisting system of vortex spinning in case 3 (α = 25 deg): (a) t = 0.00061 s, (b) t = 0.00081 s, (c) t = 0.00116 s, (d) t = 0.00143 s, (e) t = 0.00165 s, (f) t = 0.00189 s, (g) t = 0.00199 s, and (h) t = 0.00213 s

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Fig. 8

Effect of the spindle cone angle on the time series for the radial displacement at the trailing tip of the fiber

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Fig. 9

Simulation result of the fiber dynamics and airflow velocity contours in the twisting system of vortex spinning in case 4 (d = 1.1 mm): (a) t = 0.00071 s, (b) t = 0.00099 s, (c) t = 0.00132 s, (d) t = 0.00160 s, (e) t = 0.00173 s, (f) t = 0.00188 s, and (g) t = 0.00230 s

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Fig. 10

Simulation result of the fiber dynamics and airflow velocity contours in the twisting system of vortex spinning in case 5 (d = 1.2 mm): (a) t = 0.00064 s, (b) t = 0.00099 s, (c) t = 0.00124 s, (d) t = 0.00150 s, (e) t = 0.00177 s, and (f) t = 0.00230 s

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Fig. 11

Effect of the spindle diameter on the time series for the radial displacement at the trailing tip of the fiber

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