Fluid Simulation of the Airflow in Interlacing Nozzles

The airflow in interlacing nozzles is simulated on a computer to understand flow behavior inside the nozzle. The interlacing degree and loop frequency of the airflow are calculated with respect to different interlacing conditions while processing fine denier yarn thread. The results reveal that better interlacing is produced when the cross-sectional area of the inlet hole or the length of the yarn channel decreases or the inlet air pressure increases. A yarn channel with a round cross section outperforms other shapes. In addition, neither the divergent nor the seriously convergent exit provides any positive effect, except that a modest convergence might somewhat enhance interlacing. Finally, a slight obliqueness or tangential air inlet hole insertion favors the interlacing process. All these results are compared with the experimental observations by other researchers and good agreement is found.