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 condit ions while processing fine denier yarn thread. The results reveal that bett er 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 incre ases. A yarn channel with a round cross section outperforms other shapes. I n addition, neither the divergent nor the seriously convergent exit provide s any positive effect, except that a modest convergence might somewhat enha nce interlacing. Finally, a slight obliqueness or tangential air inlet hole insertion favors the interlacing process. All these results are compared w ith the experimental observations by other researchers and good agreement i s found.