圆管式压电喷头的液体分配
发布时间：2018-10-19 12:36
【摘要】：针对用于喷墨打印的圆管式压电喷头建立了计算模型,并且根据它的驱动特点选择了合适的边界条件。介绍了仿真软件针对自由表面流动问题的计算原理。然后,以乙二醇水溶液为例,计算了压电喷头分配该溶液的分配过程;利用液滴成像系统获取了不同时刻的液滴图像,验证了建立的模型和数值算法的正确性。最后,计算了压电喷头在不同输入位移、不同黏度以及不同表面张力下的液体分配过程。仿真结果显示:液体分配性能与激励位移密切相关,在72.5mN/m的表面张力作用下,10nm的输入位移很难分配黏度为4.0mPa·s的液体,而15nm的输入位移在分配黏度为4.0mPa·s液体时却能够产生卫星液滴。因此,对于某种液体寻找一个合适的激励条件非常重要,过小的激励产生不了液滴,过大的激励则会产生较大甚至多个卫星液滴;增大黏度会延缓或阻滞液滴形成过程,增大表面张力却能加快液滴形成过程。本文的计算方法对于研制新式喷头或者研究喷头的喷射能力均具有指导意义。
[Abstract]:The calculation model of the tubular piezoelectric nozzle used for inkjet printing is established, and the appropriate boundary conditions are selected according to its driving characteristics. The principle of simulation software for free surface flow is introduced. Then, the distribution process of the solution is calculated by taking the ethylene glycol aqueous solution as an example, and the droplet images at different times are obtained by using the droplet imaging system, which verifies the correctness of the established model and the numerical algorithm. Finally, the liquid distribution process of piezoelectric nozzle under different input displacement, different viscosity and different surface tension is calculated. The simulation results show that the performance of liquid distribution is closely related to the excitation displacement. Under the action of surface tension of 72.5mN/m, the input displacement of 10nm is difficult to distribute the liquid with viscosity of 4.0mPa s. The input displacement of 15nm can produce satellite droplets when the viscosity is distributed to 4.0mPa s liquid. Therefore, it is very important for a certain liquid to find a suitable excitation condition, too small an excitation can not produce droplets, too large an incentive will produce larger or more satellite droplets; increasing viscosity will delay or block the formation of droplets. Increasing surface tension can accelerate the droplet formation process. The calculation method in this paper is of guiding significance for the development of new nozzle or the study of spray capability of nozzle.
【作者单位】： 哈尔滨工业大学机器人技术与系统国家重点实验室;
【基金】：国家自然科学基金资助项目(No.51105116) 中央高校基本科研业务费专项资金资助项目(No.HIT.IBRSEM.2013038)
【分类号】：TN384;O35
，
本文编号：2281130
[Abstract]:The calculation model of the tubular piezoelectric nozzle used for inkjet printing is established, and the appropriate boundary conditions are selected according to its driving characteristics. The principle of simulation software for free surface flow is introduced. Then, the distribution process of the solution is calculated by taking the ethylene glycol aqueous solution as an example, and the droplet images at different times are obtained by using the droplet imaging system, which verifies the correctness of the established model and the numerical algorithm. Finally, the liquid distribution process of piezoelectric nozzle under different input displacement, different viscosity and different surface tension is calculated. The simulation results show that the performance of liquid distribution is closely related to the excitation displacement. Under the action of surface tension of 72.5mN/m, the input displacement of 10nm is difficult to distribute the liquid with viscosity of 4.0mPa s. The input displacement of 15nm can produce satellite droplets when the viscosity is distributed to 4.0mPa s liquid. Therefore, it is very important for a certain liquid to find a suitable excitation condition, too small an excitation can not produce droplets, too large an incentive will produce larger or more satellite droplets; increasing viscosity will delay or block the formation of droplets. Increasing surface tension can accelerate the droplet formation process. The calculation method in this paper is of guiding significance for the development of new nozzle or the study of spray capability of nozzle.
【作者单位】： 哈尔滨工业大学机器人技术与系统国家重点实验室;
【基金】：国家自然科学基金资助项目(No.51105116) 中央高校基本科研业务费专项资金资助项目(No.HIT.IBRSEM.2013038)
【分类号】：TN384;O35
，
本文编号：2281130
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