电流体力学
喷嘴
弯月面
喷射(流体)
电喷雾
材料科学
机械
电场
电压
润湿
汽化
光学
复合材料
化学
机械工程
热力学
色谱法
质谱法
电气工程
物理
工程类
量子力学
入射(几何)
作者
Trung Kiên Nguyen,Vu Dat Nguyen,Baekhoon Seong,Nguyen Hoang,Jungkeun Park,Doyoung Byun
标识
DOI:10.1016/j.jaerosci.2014.01.004
摘要
Electrospray and electrohydrodynamic (EHD) jet have been paid much attention to produce fine droplets or particles. However, although applying a constant voltage, meniscus fluctuation may occur because of the variation in electric field. There are various reasons for the change in electric field such as distance between a nozzle to a substrate, wetting condition, pressure drop, and liquid vaporization. The fluctuation of the meniscus during jetting may cause unstable jetting and spray, which results in non-uniform patterning or coating. To tackle this problem, this paper introduces an advanced control of applied voltage that keeps the meniscus stable. An image processing method called meniscus characterization is used to provide information about the meniscus shape to a controller as a feedback signal. In addition, this meniscus information is also used to evaluate an optimal voltage that is applied to the nozzle to improve the startup time in the spray and EHD ejection. The experiment results show that the shape of meniscus is stably maintained, the jetting and the electrospray also become stable and the jet startup time is reduced.
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