Abstract
Abstract During the air flow twisting process of jet vortex spinning, the moving characteristics of flexible free-end fiber are complex. In this paper, the finite element model of the fiber is established based on elastic thin rod element. According to the air pressure and velocity distribution in the airflow twisting chamber of jet vortex spinning, this paper analyzes the undetermined coefficients of the finite element kinetic differential equation of the free-end fiber following the principle of mechanical equilibrium, energy conservation, mass conservation and momentum conservation. Based on numerical simulation, this paper gets the trajectory of the free-end fiber. Finally, the theoretical result of the free-end fiber trajectory by finite element simulating is tested by an experimental method. This paper has proposed a new method to study the movement of the fiber and learn about the process and principle of jet vortex spinning.
Highlights
Jet vortex spinning twists the free-end fiber at the hollow spindle inlet by high-speed rotating air
Basal and Oxenham[2] analyzed the correlation of the jet vortex spinning process parameters and the fiber transfer in the pure cotton jet vortex spun yarn
In order to achieve the feasibility and rationality of the calculation about the nonlinear large deformation problem of the free-end fiber, we have made some simplifications and assumptions in this study as follows: (1) do not consider the reaction of the fiber to the airflow; (2) ignore the interaction between the fiber, the central strip and the inner wall of the cavity; (3) do not consider the tensile elasticity and the torsional elasticity of the fiber; (4) the free end of the fiber already exists when it is under the airflow twisting; and (5) theoretically, the force of the airflow field is continuously distributed on the fiber surface
Summary
Jet vortex spinning twists the free-end fiber at the hollow spindle inlet by high-speed rotating air. Zou et al.[9] analyzed the correlation of the hollow spindle inner diameter, the jet vortex spinning airflow velocity and the jet vortex spun yarn structure by the three-dimensional standard turbulent flow field model. Combined with the distribution characteristics of flow field air pressure and velocity in the twisting airflow chamber of jet vortex spinning, we established the finite element kinetic differential equation of the free-end fiber flexible body and analyzed the undetermined coefficients of the finite element kinetic differential equation, following the principles of mechanics balance, energy conservation, mass conservation and momentum conservation. The elastic thin rod element model is used to simulate the trajectory of free-end fiber under the high-speed rotating airflow in the twisting airflow chamber of jet vortex spinning, which is a new research method to study the process and principle of jet vortex spinning
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