Numerical prediction and experimental analysis of ends-together yarn splicing

Abstract

3Pneumatic yarn splicing is a technical process for joining two yarn ends together. The 4 process involves injecting compressed air into a splicing chamber. Inlet pressure and 5 chambers slope determine the main parameters affecting this process. In this paper, large 6 eddy simulation (LES) of the flow field in four selected splicing chambers is carried out. 7The chambers are used for splicing ends-together yarns. The results of these simulations are 8 analysed to investigate first the effects of the inlet pressure. Second, the effects of the 9 geometry of the chambers on the flow field inside the splicing chambers are determined. 10These effects are studied and analysed to interpret the experimental results, which have 11 been obtained using the same splicing chambers. This provides further insight into the 12 parameters which are important to obtain good splicing characteristics. It is demonstrated 13 that the volume of the splicing chamber and the location of the air inlet channel play crucial 14 roles in the splicing of the end-together yarns.

Modeling of yarn strength and its influencing factors in the pneumatic splicing process

“…Osman et al. 2 investigated the relationship among the splicing strength, the air inlet pressure and the cross-section area of the splicing chamber through ANSYS software. Results showed that the splicing strength increases with the increase of inlet pressure first and then decreases.…”

Numerical and experimental study on the joint forming mechanism in the pneumatic splicing process

“…Xing and Ye 11 analyzed the characteristics of the airflow in different parts of a splicing chamber by adopting a commercial CFD software, FLUENT. By carrying out large eddy simulation of the flow field in splicing chambers with various structures, Osman et al 12 gained insight into the parameters that were significant to obtain good splicing characteristics. In our previous work, the movement of filaments during the splicing process was studied by the combination of high-speed photography and a threedimensional (3D) numerical model.…”