喷墨印刷液滴的铺展特性研究

目的 研究喷墨印刷液滴相关参数对其铺展特性的影响，为喷墨印刷质量的研究奠定基础。方法 采用Fluent软件，基于VOF(Volume of Fluid)法，建立液滴撞击光滑承印物表面并铺展的仿真模型，采用PISO(Pressure-Implicit with Splitting of Operators)算法对速度和压力进行耦合，分析液滴相关参数对其撞击铺展的影响规律。结果 当液滴飞行速度为6 m/s、接触角度为40°、液滴流体黏度为0.005 Pa.s、液滴直径为0.08 mm时，液滴撞击光滑承印物表面的铺展系数最大，铺展程度最好，铺展特性最优。结论 铺展系数随液滴直径、流体黏度和接触角的增大而降低，随飞行速度的增大而增大。

Spreading Characteristics of Inkjet Printing Droplets

The work aims to study the effect of inkjet printing droplet related parameters on their spreading characteristics, so as to lay a foundation for the study of inkjet printing quality. The Fluent software was used based on the VOF (volume of fluid) method to establish and spread a simulation model of droplet impact on the surface of a smooth substrate, and the PISO (Pressure-Implicit with Splitting of Operators) algorithm was used to couple the speed and pressure. The effect of droplet related parameters on its impact spreading was analyzed. The results showed that when the droplet flying speed was 6 m/s, the contact angle was 40°, the droplet fluid viscosity was 0.005 Pa.s, and the droplet diameter was 0.08 mm, the droplet had the highest spreading coefficient, the best spreading degree, and the best spreading characteristics when impacting the smooth substrate surface. The spread coefficient decreases with the increase of droplet diameter, fluid viscosity and contact angle, and increases with the increase of flight speed.