无针式静电纺丝喷头几何形状对电场分布规律的影响机理

根据射流的质量守恒、 电荷守恒和动量守恒分析稳态射流的运动过程, 建立了控制方程组; 应用有限元分析软件COMSOL Multiphysics 5.0建立3种无针式喷头模型, 分析其外部电场的分布规律. 研究发现, 在由典型圆柱体喷头到增加辅助电极的阶梯轴喷头的几何形状变化过程中, 电场强度分布受两侧添加的辅助电极角度和增加回转体数量及回转体直径的影响, 通过设计, 电场被逐步优化. 对无针式静电纺丝装置的生产效率及纤维质量的提高具有重要意义.

Impact Mechanism of Needleless Electrospinning Spinneret Geometry on Electric Field Distribution Regularities

In the needleless electrospinning technology, the distribution and the value of electric field at spinneret are the key factors that influence the electrospinning process and the formation of nanofibers.Different geometries of the spinneret directly affect the distribution of the external electric field.Therefore, it is of practical significance for the design and optimization of needleless electrospinning spinneret through the research on the distribution of electric field from the geometry.In this paper, governing equations had been set up to analyze movement process of steady-state jet from three aspects: mass conservation, charge conservation and momentum conservation.The finite element analysis(FEA) software COMSOL Multiphysics 5.0 is used to model three needleless electrospinning spinnerets and analyze the distribution of external electric field.It is found that during the evolution from the typical cylindrical spinneret to the stepped shaft one with the added auxiliary electrodes, the distribution of electric field is influenced by the angle of the auxiliary electrodes added on both sides, plus of the number and diameters of rotary parts.The electric field is optimized step by step through a series of designs.The research is very important to the improvement of production efficiency and nanofiber quality of the needleless electrospinning equipment.