Numerical simulation of the airflow field in vortex spinning processing

Shang, Shanshan; Yang, Jianping; Yu, Chongwen

doi:10.1177/0040517518758008

Cited by 10 publications

(11 citation statements)

References 18 publications

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“…The compressed air was pumped into the tube via the two holes. After the air flow was pumped into the tube, it constantly collides with the tube wall in the form of turbulence, and finally formed an air vortex in the tube, like the vortex spinning [ 18 , 19 , 20 , 21 ]. Afterwards, the air vortex continues to flow downwards, and had an effect on the jet in the electrospinning process and caused the macromolecular chains in the jet to be entangled.…”

Section: Methodsmentioning

confidence: 99%

Control of Macromolecule Chains Structure in a Nanofiber

Tian

2020

Polymers

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Mechanical property is one of the most important properties of nanofiber membranes. Electrospinning is widely used in the preparation of nanofibers due to its advantages such as good stability and easy operation. Compared with some nature silk, the mechanical properties of nanofibers prepared by electrospinning are poor. Based on the principle of vortex spinning and DNA structure, this paper designed an air vortex electrospinning device that can control the structure of macromolecular chains in nanofibers. When a weak air vortex is generated in the electrospinning process, the macromolecule chains will entangle with each other and form a DNA-like structure so as to improve the mechanical property. In addition, when a strong air vortex is generated during the electrospinning process, the nanofibers will adhere to each other, thereby enhancing the mechanical property and enlarging the pore size.

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Section: Methodsmentioning

confidence: 99%

Control of Macromolecule Chains Structure in a Nanofiber

Tian

2020

Polymers

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“…To catch the main feature of the airflow, the calculation grids have been refined near the locations with high gradients, such as the wall surfaces, the air jet orifices, and the guided needle. Based on the grid independency test, 43 1,790,510 hexahedral/tetrahedral grids with a minimum grid size of 1 Â 10 À15 m 3 in the locations of high gradients is adopted.…”

Section: Mesh Generationmentioning

confidence: 99%

Modeling the airflow field of vortex spinning

Shang

Sun

et al. 2021

Textile Research Journal

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Vortex spinning technology adopts a high-speed swirling airflow to rotate the fibers with open-ends to form yarn with real twists. The airflow behavior within the nozzle has a great effect on the yarn-formation process. In this study, a three-dimensional calculation nozzle model and corresponding three-dimensional airflow region model were established to enable the numerical calculation; airflow behavior—pressure, velocity, and the turbulent airflow field, and the streamline of airflow—was investigated in the presence of fiber bundles within the vortex spinning nozzle. Hybrid hexahedral/tetrahedral control volumes were utilized to mesh the grids in the calculation region. To consider airflow diffusion and convection in the nozzle, the Realizable k- ε turbulence model with wall function was adopted to conduct the calculation. Dynamic and static pressure values were obtained by numerical analysis to predict the action of the inner surface of nozzle and the wall resistance on the high-speed swirling airflow. The numerical simulation of dynamic airflow behavior can generate great insight into the details of airflow behavior and its distribution characteristics, and is helpful for understanding the spinning mechanism and promoting optimization of the spinning process.

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“…It is very important to study the mutual coupling relationship between the airflow and fiber, for which scholars at home and abroad have conducted a large number of related studies. Shang et al 1 verified that the turbulence generated during the normal spinning process is much more pronounced than at the beginning of spinning by analyzing the three-dimensional numerical simulation of airflow characteristics, which is conducive to the stabilization of the spinning process and the improvement of yarn strength. Shang et al 2 developed a three-dimensional numerical model of airflow within a vortex spinning nozzle and a free-end fiber, utilized structured hexahedral meshes and unstructured tetrahedral structures to delineate the computational region of the airflow and verified the importance of dynamic numerical simulation in solving the unobservable dynamic torsion process by taking into account the physical properties of the fiber.…”

mentioning

confidence: 99%

Fiber movement during twisting in air vortex spinning

Wang,

Lv,

Dang

et al. 2023

Textile Research Journal

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In order to clarify the twisting mechanism of the air vortex spinning machine, this paper investigates the motion law of air vortex spinning fiber from the guided access into the twisting chamber during the whole process. While considering the bi-directional coupling effects of the airflow and fiber, the airflow–fiber fluid–solid coupling solution model of the guiding parts is established, and the fluid–solid bi-directional coupling solution platform is built based on ANSYS Workbench software. The movement trajectories of fibers in the process of single and double fibers entering the twisting zone from the guiding channel to the hollow spindle guiding channel were obtained, respectively. Through the fluid–solid coupling analysis, (1) under the action of airflow, the fiber movement is complex and variable, while the movement of the fiber affects the distribution of the surrounding airflow velocity and pressure. (2) Due to the asymmetric structure of the guiding channel, the airflow distribution on both sides of the fiber in motion is uneven, so that the fiber as a whole is wavy forward, and from time to time collisions occur with the tube wall. (3) The fibers are sucked into the twisting chamber under the effect of pressure difference, and the fibers are twisted under the combined effect of axial airflow and tangential airflow. The head end of the fiber enters the guided access in the middle of the hollow spindle under the guidance of the guiding pins. (4) In double fiber movement, there will be mutual adsorption, fibers becoming closer together, contact, stagger, separation and other phenomena that also affect the fiber in the airflow under the action of the twisting winding movement process.

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Numerical simulation of the airflow field in vortex spinning processing

Cited by 10 publications

References 18 publications

Control of Macromolecule Chains Structure in a Nanofiber

Control of Macromolecule Chains Structure in a Nanofiber

Modeling the airflow field of vortex spinning

Fiber movement during twisting in air vortex spinning

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