Numerical Study for the Selection of Suitable Geometry for Producing PVDF/Nano-TiO۲Hollow Fiber Membrane with Four-Nozzle Spinneret

Water and wastewater treatment using ultra filtrationhollow fiber membrane separation is one of the newestand most efficient methods in recent years that hasreceived wide attention. Due to the viscoelastic polymersolution deployed in the production of hollow fibers, thebehavior of the solution in terms of temperature andspecific geometry is very significant. Therefore, tosimulate, the present study uses ANSYS Polyflow for twodifferent geometries (H-shaped or X-shaped geometries)polymer solution, after which the geometries were createdand were practically examined. Polyvinylidene fluoride(PVDF) polymer solution at the inputs rates of ۸ and ۱۲cubic centimeters per minute was sent to the intendedgeometries and then its velocity, tension, and shear rateswere measured. Based on the data obtained, the velocityof the output X geometry for both the feed rates ofpolymer solution is considered to be more symmetricaland uniform than H geometry. Moreover, in investigatingthe shear zone, zero well reflects the better performanceof the X geometry and considering the investigation of theshear rates in two geometries, the skin layer formation ofmembrane and molecular orientation is observed; whereX geometry was found to function better.

کلیدواژه ها:

Channel ، Hollow fiber membrane ، Polymersolution ، Stress ، Viscoelastic ، Water and Wastewater.