Ansys Fluent’s Continuous Fiber Model uses a one-dimensional approach used to predict the flow in fibers and to predict the flow field in the spinning chamber.

In melt spinning, where the extruded molten polymer is sent through the nozzles into the spinning chamber, the velocity of the liquid jet increases due to gravity and the tensile force, which is applied at the take-up point of the fibers. The conservation of mass leads to a decrease in the cross-section of the jet up to the final diameter. The molten polymer is cooled by an air stream until the solidification temperature is reached.

In dry and melt spinning, production of hundreds or thousands of fibers in a spinning chamber leads to strong interaction between the fibers and the surrounding gas, requiring a coupled calculation procedure for the fibers and the fluid flow in the spinning chamber.