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Droplet formation study of a liquid micro-dispenser driven by a piezoelectric actuator

机译：压电致动器驱动的液体微分配器的液滴形成研究

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摘要

The piezoelectric-driven noncontact jetting dispenser with the characteristics of high accuracy, efficiency and applicability has been widely applied in the microelectronics packaging field to produce small droplets. The process of droplet formation and separation is the key to successful jetting. In order to study the process and show the roles of system parameters in droplet formation, the paper runs some numerical simulations and analyzes the comprehensive effects of the system parameters on the morphological change of droplets by using two dimensionless parameters Weber and Reynolds. The simulation and experiment results show that the scale of system parameters is confirmed by the lower and upper limits of Weber according to different Reynolds. If Weber is bigger than the upper limit value or smaller than the lower limit value, the jetting failure like sputtering, satellite dots jetting or adhesion will occur. During the experiments, the system parameters should be adjusted to keep the values of Weber and Reynolds in the proposed scale. The findings in this paper can be used to guide the design and control of these piezoelectric driven dispensers.
机译：压电驱动的非接触式喷射分配器具有高精度，效率和适用性的特点，已广泛应用于微电子包装领域以产生小液滴。液滴形成和分离过程是成功喷射的关键。为了研究该过程并显示系统参数在液滴形成中的角色，纸张运行了一些数值模拟，并通过使用两维参数韦伯和雷诺斯分析了系统参数对液滴形态变化的综合影响。模拟和实验结果表明，根据不同的雷诺，通过韦伯的下限和上限确认了系统参数的规模。如果韦伯大于上限值或小于下限值，则会发生喷射失效，溅射射流，卫星跳闸或粘附。在实验期间，应调整系统参数以在所提出的规模中保持韦伯和雷诺的值。本文中的研究结果可用于引导这些压电驱动分配器的设计和控制。

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