He Bing, Yang Sucui, Qin Zhangrong, Wen Binghai, Zhang Chaoying
Guangxi Key Lab of Multi-source Information Mining & Security, Guangxi Normal University, Guilin, 541004, China.
Sci Rep. 2017 Sep 19;7(1):11841. doi: 10.1038/s41598-017-12189-7.
This paper describes a lattice Boltzmann-based binary fluid model for inkjet printing. In this model, a time-dependent driving force is applied to actuate the droplet ejection. As a result, the actuation can be accurately controlled by adjusting the intensity and duration of the positive and negative forces, as well as the idle time. The present model was verified by reproducing the actual single droplet ejection process captured by fast imaging. This model was subsequently used to investigate droplet formation in piezoelectric inkjet printing. It was determined that the wettability of the nozzle inner wall and the surface tension of the ink are vital factors controlling the print quality and speed. Increasing the contact angle of the nozzle inner delays the droplet breakup time and reduces the droplet velocity. In contrast, higher surface tension values promote earlier droplet breakup and faster drop velocity. These results indicate that the hydrophilic modification of the nozzle inner wall and the choice of inks with high surface tensions will improve printing quality.
本文描述了一种基于格子玻尔兹曼方法的用于喷墨打印的二元流体模型。在该模型中，施加一个随时间变化的驱动力来驱动液滴喷射。结果，通过调整正负力的强度和持续时间以及空闲时间，可以精确控制驱动。通过重现快速成像捕获的实际单液滴喷射过程，验证了本模型。随后，该模型被用于研究压电喷墨打印中的液滴形成。结果表明，喷嘴内壁的润湿性和墨水的表面张力是控制打印质量和速度的关键因素。增大喷嘴内壁的接触角会延迟液滴破裂时间并降低液滴速度。相反，较高的表面张力值会促进液滴更早破裂和更快的下落速度。这些结果表明，对喷嘴内壁进行亲水性改性以及选择具有高表面张力的墨水将提高打印质量。
