Influence of Bi-piezoelectric micro-valve's parameters on jet performance

Piezoelectric Micro-valve is significant device in semiconductor packaging, surface mount and LED packaging field. The jetting dispensing process related needle high-speed acceleration movement and mechanism of droplets generation in complex coupling environment is the theoretical basis of the jet dispenser design. In this paper, a two-dimensional axisymmetric model based on Volume of fluid (VOF) method is built by computational fluid dynamics(CFD) software. Fluent dynamic grid technique is introduced in numerical simulation to analyzed the fluid-solid coupling process. The mechanism of on-demand dispensing is analyzed by simulation. Then the jetting dispensing platform is built. The results show that the volume of droplet will increase with the increase of the needle stroke and the filing pressure linearly, and the needle stroke is the main factor. It will provide theoretical basis for improving consistency of mechanical collision based jet dispenser.