Three dimensional flow patterns in yarn duct of interlacers with various cross-sectional shapes

In order to design an interlacer with better performance for processing chemical filament fibers,computational fluid dynamics(CFD) software package ANSYS CFX to examine the flow patterns inside seven interlacers with different cross-sectional shapes in yarn duct and the effect of the flow patterns on the performance of interlacers.The performance of the interlacers is evaluated by the entanglement factor and entanglement strength of interlaced yarns.From the results of calculation,vortices in yarn ducts with middle cross-sections,including the yarn duct with injection orifice axis cross section,can afford bigger space for yarn revolving,and higher velocity on the axis of yarn duct is good for yarn opening and tangling.However,too high a velocity of the compressed air makes filaments stick on the surface of yarn ducts,hindering them from tangling with each other and lowering the entanglement degree of interlaced yarns.