电流体动力学近场直写射流成形的数值模拟-包装工程.PDF

包 装 工 程 第38 卷 第 5 期 ·216 · PACKAGING ENGINEERING 2017 年3 月 电流体动力学近场直写射流成形的数值模拟 戴姚波，张礼兵，黄风立，左春柽，吴婷 （嘉兴学院，嘉兴 314001 ） 摘要： 目的 研究电流体动力学近场直写的射流成形机理及其规律，探索电流体动力学近场直写射流成 形的影响因素。方法 首先对电流体动力学近场直写的射流成形机理进行理论分析，并构建数学模型， 然后以去离子水为溶剂配成质量分数为 13% ～17%的聚氧化乙烯作为模拟材料，采用有限元数值模拟方 法进行仿真试验验证。结果 在电场力作用下，液滴会发生流变形成弯液面，随着电荷密度的增大，弯 液面逐渐形成泰勒锥，当电荷密度进一步增加，电场力克服了液体表面张力，在泰勒锥顶端产生射流； 电压、喷射高度和入口压力等工艺参数会影响射流形态。结论 电压越大或喷射高度越小，射流受到的 电场力越大；入口压力越大，锥形越长；通过调整工艺参数可以改善射流形态；电流体动力学近场直写 方法可实现聚合物溶液高分辨率的喷墨印刷。 关键词： 电流体动力学；近场直写；射流成形；数值模拟分析 中图分类号：TS853+ .5 文献标识码：A 文章编号： 1001-3563(2017)05-0216-06 Numerical Simulation of Jet Forming for Electrohydrodynamic Near-Field Direct Writing DAI Yao-bo , ZHANG Li-bing, HUANG Feng-li, ZUO Chun-cheng, WU Ting (Jiaxing University, Jiaxing 314001, China) ABSTRACT: The work aims to research the mechanism and law of jet forming for the electrohydrodynamic near-field direct writing and explore its influencing factors. Firstly, theoretical analysis on the jet forming mechanism of the elec- trohydrodynamic near-field direct writing was carried out, and the mathematical model was built. Then, with polyoxye- thylene (mass fraction of 13% ～17%) as simulation material, which was prepared by deionized water (as solvent), the fi- nite element numerical simulation method was used to carry out experimental verification. Under the action of electric field force, droplet would be subject to flowing deformation and form a meniscus. With the increase in the electric charge density, th