numerical study for the selection of suitable geometry for producing pvdf/nano-tio2 hollow fiber membrane with four-nozzle spinneret

Water and wastewater treatment using ultra filtration hollow fiber membrane separation is one of the newest and most efficient methods in recent years that has received wide attention. due to the viscoelastic polymer solution deployed in the production of hollow fibers, the behavior of the solution in terms of temperature and specific geometry is very significant. therefore, to simulate, the present study uses ansys polyflow for two different geometries (h-shaped or x-shaped geometries) polymer solution, after which the geometries were created and were practically examined. polyvinylidene fluoride (pvdf) polymer solution at the inputs rates of 8 and 12 cubic centimeters per minute was sent to the intended geometries and then its velocity, tension, and shear rates were measured. based on the data obtained, the velocity of the output x geometry for both the feed rates of polymer solution is considered to be more symmetrical and uniform than h geometry. moreover, in investigating the shear zone, zero well reflects the better performance of the x geometry and considering the investigation of the shear rates in two geometries, the skin layer formation of membrane and molecular orientation is observed; where x geometry was found to function better.