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

Pei, Zeguang

doi:10.1115/1.4026445

Cited by 5 publications

(6 citation statements)

References 15 publications

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“…Through the coupled solution of the two models, various results of flow field and structural field can be obtained. Pei et al (2018) and Pei (2014) established a three-dimensional flow field computational fluid dynamics model of the air-jet vortex-spinning twisting cavity, and the law of the fiber movement and the yarn structure forming process were indirectly analyzed based on the law of the single-phase airflow field, from the perspective of the flow field. Pei et al (2012), Yan et al (2019) and Zou et al (2015) established a two-dimensional model that can reflect the physical and mechanical characteristics of flexible fibers.…”

Section: Introductionmentioning

confidence: 99%

Research on the motion law of fiber in the vortex field inside the nozzle based on ADINA fluid–structure coupling model

Han

Gao

2021

IJCST

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PurposeThe purpose of the paper is researching on the motion law of fiber in the vortex field inside the nozzle.Design/methodology/approachA three-dimensional calculation model was established using the MVS861 (Muratec Vortex Spinning) air-jet vortex-spinning nozzle as the prototype, and the fluid–solid coupling calculation module in the finite element calculation software ADINA (Adina System) was used to numerically analyze the fiber-air flow two-phase coupling. At the same time, the effect of the air pressure at the nozzle on the two-phase flow is studied.FindingsThe results show that after the air flow ejected through the nozzle, a vortex field will be generated in the flow field to push the internal fiber to move toward the nozzle outlet in a wave motion; as the air pressure at the nozzle increases, the fiber movement period becomes shorter and the oscillation frequency becomes higher; increasing the air pressure at the spray hole can improve the working efficiency of fiber twisting and wrapping.Originality/valueThe research present an effective and feasible theoretical model and method for the motion law of fiber in the vortex field inside the nozzle based on ADINA fluid–structure coupling model.

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Section: Introductionmentioning

confidence: 99%

Research on the motion law of fiber in the vortex field inside the nozzle based on ADINA fluid–structure coupling model

Han

Gao

2021

IJCST

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“…Thereinto, establishing models of a flexible and high-aspect-ratio fiber and its interaction with the flow field are the key to the simulation. Pei 11 and Jin et al 12 adopted the arbitrary Lagrangian-Eulerian (ALE) method to model the motion of a flexible fiber in the airflow field in a textile machine. The main challenge for the ALE method is the difficulty in dealing with an extremely large deformation of a structure in the flow field.…”

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confidence: 99%

Simulation of the dynamics of a flexible fiber in the swirling airflow in a nozzle containing cylindrical and divergent conical sections

Pei

2023

Textile Research Journal

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Swirling airflow plays a key role in textile production processes. The structure and properties of a textile processed by utilizing swirling airflow depend to a large extent on the dynamics of the fibers in the flow. This work presents a numerical investigation of the dynamics of a flexible fiber in the tangentially injected swirling airflow in a nozzle containing cylindrical and divergent conical sections, which is frequently encountered during textile production. Simulation of the three-dimensional, transient, compressible and turbulent swirling airflow field in the nozzle is first conducted. A model for the particle-level simulation of a flexible fiber in a wall-bounded flow is consequently adopted for studying the fiber motion in the nozzle. This model assumes the fiber to be composed of several massless elastic rods connected by rigid ball–socket joints where various forces and torques are exerted. The stretching, bending and twisting deformations of the fiber as well as the fiber–wall collision can all be modeled. The motional characteristics of the flexible fiber can be obtained by solving the translational and rotational equations for all the ball–socket joints in the fiber model. Based on the model, the effects of two process and nozzle geometric parameters – the nozzle pressure and radial position of the injectors – on the fiber motion are studied. The results show that the model and methods presented in this work can provide effective and useful insights into the dynamics of flexible fiber in the swirling airflow field inside complex-structured nozzles employed in the textile production processes.

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“…[7][8][9][10][11] Numerical simulation then became a useful tool by proposing flexible fiber models and modeling the dynamic behavior of the flexible fibers in the flow field inside the nozzle based on which yarn formation principle of vortex spinning was studied. [12][13][14][15][16][17] However, numerical simulation not only simplifies the physical properties of the fibers, but also approximates the boundary conditions of the flow field, and thus presents theoretical results that lack reliability. In comparison, due to the tight and confined space in the nozzle with a complex structure, there are great challenges to experimentally study the dynamic behavior of the fibers in the yarn formation process of vortex spinning.…”

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confidence: 99%

Experimental study on the formation of core-spun yarn manufactured on a modified vortex spinning system

Pei

2019

Textile Research Journal

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Aiming at achieving online monitoring of the yarn formation process of vortex spinning, this paper presents a direct observation method that adopts a charge-coupled device camera fitted with an industrial endoscope that can reach into the nozzle chamber through a small hole drilled on the nozzle wall. Local pressure distortion in the vortex chamber due to the mounting of the observation apparatus was found experimentally. However, the yarn quality was not significantly affected, indicating that the proposed method has the potential to find industrial applications. Based on this method, the formation process of core-spun yarn containing a copper wire manufactured on a modified vortex spinning system is successfully observed. The results show that the core wire is covered by the main strand (core fibers), while the main strand is false-twisted during the yarn formation process. The level of false twist in the main strand fluctuates with time. The level of false twist in the main strand is higher in the upstream region, while it gradually decreases toward the downstream. Mostly, the trailing ends of some fibers are separated from the main strand and expand over the spindle tip to wrap around both the core fibers and core wire to form wrapper fibers in the yarn, while the leading ends of a smaller number of fibers are separated to form wrapper-wild fibers in the yarn. The proposed method can be extended to the study of fiber movement in confined spaces in other textile manufacturing processes.

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

Cited by 5 publications

References 15 publications

Research on the motion law of fiber in the vortex field inside the nozzle based on ADINA fluid–structure coupling model

Research on the motion law of fiber in the vortex field inside the nozzle based on ADINA fluid–structure coupling model

Simulation of the dynamics of a flexible fiber in the swirling airflow in a nozzle containing cylindrical and divergent conical sections

Experimental study on the formation of core-spun yarn manufactured on a modified vortex spinning system

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