Numerical study of the three-dimensional preliminary flow field in the ring spinning triangle

Hui Fen Guo, Ngan Yi Kitty Lam, Feng Yan, Chenxiao Yang, Li Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

7 Citations (Scopus)

Abstract

The spinning triangle is a critical region in ring spinning. To understand the formation principle of the triangle zone, a dynamic mesh model with SIMPLEC algorithm is employed to study airflow around the rotating front roller-pair. The effects of both the top roller offset and the drafting inclination angle are also discussed. The bubble-type vortex breakdown and vortices around two cylinders are observed. The bubble-type vortices will help the edge fibers to converge to the center. A contour line with special value is defined to describe the spinning triangle. A dynamic triangle zone is also observed with time. As the forward offset of the top roller increases, the velocities in the stream-wise (x- and y-) directions decrease and the maximum values of the skin friction deflect gradually towards the apex of the roller. However, the z-velocity for the 3 mm top roller offset is the largest and results in a good converging for fibers and, consequently, increases the yarn tension. With increasing the inclination angle, the velocities increase while both the defined triangle zones and the maximum values of the friction coefficients decrease, thus speeding up the fibers transportation. The simulation results agree well with the theory analysis and experiments of spinning.
Original languageEnglish
Pages (from-to)1728-1737
Number of pages10
JournalTextile Research Journal
Volume86
Issue number16
DOIs
Publication statusPublished - 1 Oct 2016

Keywords

  • drafting inclination angle
  • dynamic mesh
  • flow characteristics
  • spinning triangle
  • top roller offset

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Polymers and Plastics

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