关键词: 按需喷射, 仿真, 微喷试验, 压电驱动膜片式

Abstract: Micro-droplet jetting technology, a digital controlled micro-droplets generation and dispensing technology, is showing strong potential for application. A piezoelectric actuated diaphragm-driven micro-droplet jetting technology is presented to overcome the defects of the existing microjetting technology. The primary principle of the piezoelectric actuated diaphragm-driven microjetting technology is introduced and theoretical analysis is made to establish the mathematical model. Two-dimensional axisymmetric simulation model is built to predict the fluid interface during microjet process by CFD software and volume of fluid(VOF) method. The effect of the parameters on the droplet ejection characteristics based simulations is analyzed, such as droplet diameter and droplet ejection velocity. On the basis of the simulation results, a piezoelectric actuated diaphragm-driven microdroplet jetting experimental system is developed and made experiments using liquid material with viscosity ranging from 0 cP to 150 cP. The experiments demonstrate that this microjetting technology has a good performance on micron droplets generation and dispensing. And the experimental results agree well with the simulation results, which proves this simulation model and method is correct.

Key words: Drop-on-demand, Micro-droplet jetting experiment, Piezoelectric actuated diaphragm-driven, Simulation