Fluid Simulation of the Airflow in Texturing Jets

Abstract

This study attempts to understand flow behavior inside texturing nozzles by computer simulation. The texturing degree and fluctuation number are calculated for different texturing conditions while processing fine denier yarn thread. Simulation results indicate that texturing is enhanced when the cross-sectional area of the inlet hole reaches 1/4, or when the ratio of the length over diameter ( L/D) of the yarn channel is between 8 and 10. Additionally, the obliqueness of the air inlet hole with an angle between 45° and 60° facilitates texturing. A yarn channel with a noncircular cross section outperforms one with circular cross section. Finally, a yarn channel with a 10° divergent exit can benefit texturing. All these results are compared with the experimental observations of other researchers or with satisfactory industrial nozzles, and there is good agreement.