Numerical simulation of fiber motion in the nozzle of Murata vortex spinning machine

Abstract

In this paper, a two-dimensional model for rationally describing the physical and mechanical characteristics of a flexible fiber is presented. The arbitrary Lagrangian-Eulerian technique is adopted to solve the fluid-structure interaction between the fiber and the airflow in the nozzle of a Murata vortex spinning (MVS) machine. The contact problem arising between the fiber and the nozzle wall is also solved. The motion and deformation of the fiber in the airflow inside the MVS nozzle are successfully simulated. The results show that with the action of the airflow, the fiber shows helical movement with wave shape. During its downstream motion, the fiber contacts the inner wall of the spindle frequently. The trailing end of the fiber whirls within the nozzle chamber with great amplitude. The separation and wrapping motion of the fiber take place and twists are inserted into the fiber strand before the trailing end of the fiber enters the spindle entirely. The intensity of the twists inserted into the yarn can be evaluated by the amplitude and the frequency of the periodical rotation of the trailing end of the fiber.

Comparative analysis of different jet vortex spinning hollow spindle groove structures on yarn mechanism and yarn properties

“…The three-dimensional flow field between the nozzle and the hollow spindle is simulated with the Fluent 6.3. 13 The method of numerical simulation is model RNG of standard k-ɛ turbulence, and the near-wall treatment is the standard wall function. We obtain the flow field velocity curve in the position of fiber axis from the simulation results, as shown in Figure 5.…”

Numerical simulation and experimental research of fiber motion in vortex spinning

“…Due to the complexity of the internal structure of the vortex spinning nozzle and the fiber motion, many scholars 3–6 have simplified the theoretical model in various aspects to facilitate research. Most of them 7–9 used computational fluid dynamics (CFD) software to build two-dimensional (2D) or three-dimensional (3D) models to simulate the air-flow field within the nozzle, and examined the change of the air-flow field with different nozzle parameters and the influence of air-flow field on the fiber motion.…”