No abstract

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.

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.

Anti-aging biomaterial (CSDB) ameliorates tissue and cell potential dysfunction through reprogramming stem cells from a senescence state and altering the extracellular matrix microenvironment (ECM) to prolong longetivity.