Abstract:

To investigate the effect of turbulent airflow field distribution and polymer solution jet flapping motion on solution-blown fiber morphology, the turbulent airflow field of a solution-blowing annular jet was numerically simulated using the computational fluid dynamic approach, polyacrylonitrile (PAN) solution jet flapping motion was captured with a high-speed camera and the motion law was analyzed. The simulations demonstrate that centerline velocity and turbulent intensity increases with the increase of air pressure; The experiments show that PAN fiber diameters decrease and become more uniform as the air pressure increases. However, the fiber morphology become worse, with the emergence of some fiber strands under even higher air pressures. Fiber morphology is correlated with stretching effects of airflow, bending instability and flapping motion of polymer solution jet, and solvent evaporation during solution-blowing process.