One of the main issues in piezoelectric inkjet (PIJ) printing is the formation of satellite drops which can result in a degradation of print quality and failure of functional device. This work to this purpose is seeking a new solution to reduce or even eliminate the satellite in PIJ by designing a coaxial airflow-assisted piezoelectric drop-on-demand droplet generator for aqueous solutions and investigating the droplet jetting behavior in coaxial airflow under different operating conditions. Effects of waveform parameters in combination to the impact of the coaxial airflow pressure on the pinch-off, breakup/recoil of the free liquid thread, as well as formation and recombination of the primary drop and satellite are analyzed. Decrease of the length and velocity of liquid thread at pinch-off with the increase of coaxial airflow pressure has been observed, while the pinch-off time is independent of the coaxial airflow pressure. The coaxial airflow can facilitate the delay or elimination of breakup of the free-flying liquid thread as well as the recombination of the satellite with the primary drop. The results of this study indicate the proposed method could be a promising way of reducing satellite drops in piezoelectric inkjet printing.

压电喷墨（PIJ）印刷中的主要问题之一是卫星滴的形成，这会导致打印质量下降和功能设备故障。为此目的的工作是通过设计用于水溶液的同轴气流辅助压电按需液滴发生器，并研究不同工作条件下同轴气流中的液滴喷射行为，从而寻求一种新的解决方案，以减少甚至消除PIJ中的卫星。 。分析了波形参数对同轴气流压力对夹断，自由液体螺纹的断裂/反冲以及初生液滴和卫星的形成和复合的影响。已经观察到随着同轴气流压力的增加，在夹断时液体线的长度和速度减小，而夹断时间与同轴气流压力无关。同轴气流可以促进延迟或消除自由飞行的液体线的断裂以及卫星与主要液滴的重组。这项研究的结果表明，所提出的方法可能是减少压电喷墨印刷中卫星滴的一种有前途的方法。