A Level- set method coupled with the Navier-Stokes equations was applied to simulate the breakup process of polymer jet during melt blowing. The initial perturbation was represented by a trigonometric function. The theory of the polymer jet breakup process driven by surface tension was explained and the breakup process was illustrated visually by simulation results. By varying the parameter values in the model, the effects of viscosity, diameter, surface tension, and surrounding perturbation on the fiber breakup process were discussed. Experiments were conducted to explore the effects of processing conditions on the fiber breakup process and validate the simulation results. It is suggested that lowering the surface tension of polymer through physical and chemical modification can help to reduce the possibility of polymer jet breakup and produce melt blown nonwovens with better quality.

应用Levelset方法与Navier-Stokes方程相结合来模拟熔体吹塑过程中聚合物射流的破裂过程。最初的扰动由三角函数表示。解释了由表面张力驱动的聚合物射流破裂过程的理论，并通过仿真结果直观地说明了破裂过程。通过改变模型中的参数值，讨论了粘度，直径，表面张力和周围扰动对纤维断裂过程的影响。进行实验以探索加工条件对纤维断裂过程的影响并验证模拟结果。