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首页> 外文期刊>Journal of Micromechanics and Microengineering >Some considerations for designing a pneumatic micro-droplet generator
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Some considerations for designing a pneumatic micro-droplet generator

机译：设计气动微液滴发生器的一些考虑因素

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摘要

Micro-droplet ejection is a liquid dispensing technology that has potential applications in many fields. Specifically, pneumatic ejection is actuated by a solenoid valve, which is set to 'conduction' state for a brief period of time Delta t. High pressure gas of P-0 enters the liquid reservoir, then releases through a venting tube, creating a oscillating pressure waveform P(t), forcing the liquid out through a tiny nozzle to form a micro-droplet. For each actuation, P(t) is acquired by a high-speed pressure sensor, and the ejection state is obtained by high-speed photography and image processing methods. Some issues for the design of pneumatic micro-droplet ejector are discussed. For simulation of P(t), it is proposed within an electro-acoustic analogy picture that the acoustic resistance of the venting tube is mainly due to viscous effect and may vary with time during the whole ejection process. Based on this assumption, the calculated P(t) is more consistent with the actual measurement. Experimentally, the droplet ejection process for different length of venting tube is studied. With P-0 and Delta t set, by increasing the venting tube length L, both the peak value P-MAX1 and duration of the first positive pressure period increase, and more droplets are ejected from a single actuation. By setting different P-0, P-MAX1 for different L is tuned to an identical and appropriate value, so that single droplet is ejected due to the first positive pressure period. However, with the increase of L, the peak value of the second positive pressure period P-MAX2 increases. There is a certain probability that another droplet is ejected. It is realized that the increase of L can reduce gas consumption, but the multiple ejection is a drawback that should be considered in the design of pneumatic ejection system.
机译：微液滴喷射是一种液体分配技术，在许多领域都有潜在的应用。具体来说，气动喷射由一个电磁阀驱动，该电磁阀被设置为“传导”状态，持续一小段时间δt。P-0的高压气体进入储液罐，然后通过排气管释放，产生振荡压力波形P（t），迫使液体通过一个小喷嘴流出，形成微液滴。对于每次驱动，P（t）由高速压力传感器获取，弹射状态由高速摄影和图像处理方法获得。讨论了气动微液滴喷射器设计中的一些问题。对于P（t）的模拟，在电声模拟图中提出，排气管的声阻主要由粘性效应引起，并且在整个喷射过程中可能随时间而变化。基于这一假设，计算出的P（t）与实际测量值更为一致。实验研究了不同排气管长度下的液滴喷射过程。设置P-0和Delta t时，通过增加通风管长度L，峰值P-MAX1和第一个正压周期的持续时间都会增加，并且一次驱动会喷出更多液滴。通过设置不同的P-0，将不同L的P-MAX1调整为相同且适当的值，以便单个液滴因第一正压周期而喷射。然而，随着L的增加，第二正压周期P-MAX2的峰值增加。有一定的可能性，另一个液滴被喷射出来。研究表明，增加L可以降低气体消耗，但多次喷射是气动喷射系统设计中应考虑的一个缺点。

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