Flow Simulation of Fiber Suspensions in Polymeric Fluid through Abrupt Contraction

The flow pattern and the orientation of fiber suspensions in polymeric fluids through a two-dimensional abrupt contraction are calculated using the Giesekus model and the Dinh-Armstrong model. The flow pattern of fiber suspensions in polymeric fluids is different from that of polymeric fluid; a vortex near the salient corner in the suspension flow becomes larger than that in the polymeric fluid flow. The dependence of the vortex length on a mobility parameter α in the Giesekus model and on a characteristic parameter of fiber suspension in the Dinh-Armstrong model is discussed.