Numerical simulation of flow field in the pneumatic compact spinning systems using Finite Element Method. Issue 3 (21st June 2018)

• Record Type: Journal Article
• Authors: Su, Xuzhong; Liu, Xinjin; Liu, Xiaoyan
• Is Part Of: International journal of clothing science and technology. Volume 30:Issue 3(2018)
• Page Start: 363
• Page End: 379
• Publication Date: 2018-06-21
• Subjects: FEM -- Numerical simulation -- Pneumatic compact spinning -- Flow field; Clothing and dress -- Periodicals; Textile fabrics -- Periodicals; 677
• DOI: 10.1108/IJCST-11-2017-0180
• Languages: English
• ISSNs: 0955-6222

Abstract

Abstract : Purpose: Pneumatic compact spinning is the most widely used compact spinning method at present, in which the negative pressure airflow is used to condense the fiber in order to decrease the spinning triangle and improve the yarn qualities. Therefore, the research on flow field in the condensing zone is always the emphasis for pneumatic compact spinning. The paper aims to discuss these issues. Design/methodology/approach: By using finite element method (FEM), the flow field in two kinds of pneumatic compact spinning was studied. Taking three kinds of cotton yarns as examples, with the help of high-speed camera system OLYMPUS i-SPEED3, the motion trajectory of fiber strand in the condensing zone was obtained. Three-dimensional physical models of the condensing zone of the two compact spinning systems were obtained according to the measured parameters of practical spinning systems. Findings: It is shown that on the both left edge of B1 line and right edge of B2 line, the airflow inflows to the center line of suction slot, and the condensed effects are produced, correspondingly. In the condensing zone, there are three condensing processes acting on the fiber strand, including the rapid condensing effects in the front condensing zone, the adequately condensing effects in the middle condensing zone, and stable output effects in the back condensing zone. Originality/value: By using FEM, numerical simulations of three-dimensional flow field in condensing zone for two kinds of pneumatic compact spinning with lattice apron were presented, and corresponding spun yarn qualities were analyzed.