| 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 |
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| 基金项目:浙江省自然科学基金（LZ14E050002）；浙江省公益性技术应用研究计划（2015C31069）；浙江省教育厅一般科研项目（Y201534088）；国家级大学生创新创业训练计划（201610354017） |
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| Numerical Simulation of Jet Forming for Electrohydrodynamic Near-Field Direct Writing |
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DAI Yao-bo, ZHANG Li-bing, HUANG Feng-li, ZUO Chun-cheng, WU Ting
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Jiaxing University, Jiaxing 314001, China
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| 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 electrohydrodynamic near-field direct writing was carried out, and the mathematical model was built. Then, with polyoxyethylene (mass fraction of 13%～17%) as simulation material, which was prepared by deionized water (as solvent), the finite 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, the meniscus gradually formed the Taylor cone. With a further increase in charge density, electric field force overcame the surface tension of the liquid, and jet flow was generated at the top of Taylor cone. Parameters, such as voltage, jetting height and inlet pressure, would affect the jet pattern. The larger the voltage or the lower the jet height, the greater the electric field force of the jet flow. The greater the inlet pressure, the longer the Taylor cone. The jet pattern can be improved by adjusting the process parameters. The electrohydrodynamic near-field direct writing can achieve the high-resolution ink-jet printing of polymer solution. |
| Key words: electrohydrodynamic near-field direct writing jet forming numerical simulation analysis |
