半封闭自由表面式静电纺喷头尖端参数对电场强度及其均匀性的影响  

Influence of tip parameters of semi-enclosed free-surface electrostatic spinning nozzle on electric field strength and uniformity

作　　者：刘健[1,2] 王程皓 董守骏 刘泳汝 尹兆松 潘山山 LIU Jian;WANG Chenghao;DONG Shoujun;LIU Yongru;YIN Zhaosong;PAN Shanshan(School of Mechanical Engineering,Tiangong University,Tianjin 300387,China;Center of Engineering Practice Training,Tiangong University,Tianjin 300387,China)

机构地区：[1]天津工业大学机械工程学院,天津300387 [2]天津工业大学工程教学实习训练中心,天津300387

出　　处：《毛纺科技》2024年第10期115-122,共8页Wool Textile Journal

基　　金：天津市自然科学基金面上项目(22JCYBJC01470)。

摘　　要：在实验过程中设计的半封闭自由表面式静电纺丝喷头,由于内外2层尖端电场不均匀,导致在纺丝初期外层开始形成泰勒锥时内层依旧是液滴,针对该问题,对此喷头的尖端进行电场分析和优化。利用COMSOL对喷头初始模型进行电场模拟,其尖端平均电场强度为2710 kV/m,CV值为18%。将初始模型的叶片排布优化为对齐镊合和错位镊合并改变其尖端角度,根据实际模型测得外层尖端角度的变化范围为63.90°~160.78°,内层尖端角度变化范围为43.66°~170.22°,利用COMSOL对2种排列从内外层均为70°到内外层均为160°的模型进行电场模拟,将得到的仿真数据拟合成方程,当对喷头施加30 kV电压且接收极接地时,得到对齐镊合且外层为71°、内层为45°时尖端电场强度平均值为5643 kV/m,CV值为11%;错位镊合且外层为117°、内层为45°时尖端电场强度平均值为4773 kV/m,CV值为10%。再经过均匀电场的理论计算得出对齐镊合时喷头中轴线上2个点受到的电场力比错位镊合时分别小8.65%和14.96%,根据仿真模拟和理论计算结果得出,喷头采用对齐镊合且外层为71°、内层为45°时为最优,其尖端电场强度相对于优化前的模型提高了108%,,CV值降低了38.89%,故在同等条件下该模型不会因为内外电场不均匀而导致多射流不同步。实验过程中,改进的2种喷头在30 kV电压下均无液滴。对齐镊合喷头在20 kV电压下可以实现稳定纺丝,错位镊合喷头在24 kV下可以实现稳定纺丝。The tips of outer layer of the designed semi-enclosed free-surface electrospinning nozzle began to form Taylor cone at the initial spinning stage while the tips of the inner layer still hung liquid droplet during the experimental process.To solve this problem,the electric field analysis and optimization were carried out on the tips of the nozzle.The electric field simulation on the initial model was carried out by COMSOL,and the average electric field mode of the tips was 2710 kV/m and the CV value was 18%.The blade arrangement of the nozzle was optimized to align and misalign and change the angles between the tips.According to the actual model,the angle of the outer tips angle changed from 63.9°to 160.78°,and the angle of the inner tips changed from 43.66°to 170.22°.COMSOL was used to simulate the two kinds of arrangement from both inner and outer layers of 70°to both inner and outer layers of 160°,and the obtained simulation data were fitted into equations.When 30 kV voltage was applied to the tips and the receiving stage was grounded,the average tip electric field mode is 5643 kV/m when the alignment meshing and the outer layer of 71°and the inner layer of 45°,and the CV value is 11%.The misaligned meshing and the outer layer is 117°and the inner layer is 45°,the average electric field mode is 4773 kV/m and the CV value is 10%.After the theoretical calculation of the uniform electric field,it was concluded that the electric field force on the two points of the nozzle central axis during the alignment meshing is 8.65%and 14.96%smaller than that during the misalignment meshing,respectively.According to the simulation and theoretical calculation results,the model should be aligned meshing and the outer layer is 71°and the inner layer is 45°and the electric field mode at the tips of the model is 108%higher than that before the optimization.The CV value is reduced by 38.89%.Therefore,under the same conditions,the model will not cause multi-jet a synchronization due to non-uniform internal and external e

关 键 词：静电纺丝 半封闭自由表面式喷头 电场模拟 电场强度 CV值 

分 类 号：TH174.8[机械工程—机械制造及自动化]