纳米银均匀喷射过程的数值计算与仿真

发布时间：2018-03-09 04:29

本文选题：微滴喷射　切入点：纳米银　出处：《机械设计与制造》2016年10期 　论文类型：期刊论文

【摘要】：微滴喷射均匀液滴喷射过程受到多种因素的制约,包括压力波幅值、液滴物性(黏度、表面张力等)、喷嘴尺寸等。为深入理解微滴喷射过程机理,基于流体体积法建立了均匀液滴喷射数值模型,研究了压电驱动电压幅值对低粘度纳米银墨水稳定喷射行为的影响。通过数值仿真,给出了驱动电压幅值与液滴断裂长度、液滴飞行速度的数值关系,以及液滴飞行速度与卫星液滴的变化关系。采用27μm喷嘴直径的工业喷头构建微滴喷射系统,低粘度纳米银墨水为喷射材料,通过观测喷印到光面相纸的液滴尺寸及卫星液滴数量对数值模型进行实验验证。结果表明,液滴飞行速度取决于驱动电压幅值,液滴尺寸分布及卫星液滴数量取决于液滴飞行速度,与数值模型相吻合。通过数值模型仿真,针对纳米银墨水物性指标匹配合适的驱动电压幅值,生成均匀液滴流,对微液滴成型的工业化应用具有重要的理论指导意义。
[Abstract]:The process of droplet injection is restricted by many factors, including the amplitude of pressure wave, the properties of droplet (viscosity, surface tension, etc.), the size of nozzle and so on. Based on the fluid volume method, a numerical model of uniform droplet injection is established, and the effect of piezoelectric driving voltage amplitude on the stable spray behavior of low viscosity nano-silver ink is studied. The driving voltage amplitude and the liquid drop breaking length are given by numerical simulation. The numerical relationship of droplet velocity and the relationship between droplet velocity and satellite droplet. A micro droplet injection system was constructed with an industrial nozzle with a diameter of 27 渭 m. The low viscosity nano-silver ink was used as the injection material. The numerical model is verified by observing the size of droplet and the number of satellite droplets. The results show that the speed of droplet flying depends on the amplitude of driving voltage. The size distribution of the droplet and the number of the satellite droplets depend on the droplet flying speed, which are consistent with the numerical model. Through the simulation of the numerical model, the proper driving voltage amplitude is matched according to the physical properties of the nano-silver ink, and the uniform droplet flow is generated. It has important theoretical guidance significance for the industrial application of micro droplet molding.
【作者单位】：中国科学院沈阳自动化研究所;中国科学院大学;
【基金】：国家863计划项目(2014AA052102)
【分类号】：TH16

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