Simulation of contraction flow of concentrated acrylic copolymer/1-butyl-3-methylimidazolium chloride solution through spinneret orifice.

The simulation of the contraction flow of concentrated acrylic copolymer/1-butyl-3-methylimidazolium chloride (P(AN-co-IA)/[BMIM]Cl) solution through spinneret orifice was carried out for the design of suitable spinneret. Geometry and mathematical models were established according to rheological behaviours and material parameters. The effects of channel geometry on variation of viscosity were simulated and discussed in detail. The numerical results show that an increase in aspect ratio resulted in the decrease in viscosity and a decrease in entrance angle may reduce the size of 'dead' region near the corner. From numerical investigations, the geometry with aspect ratio of 3∶1 and entrance angle of 30° was found to be suitable optimum geometry for concentrated polymer solution during dry-jet wet spinning. [ABSTRACT FROM AUTHOR]