| Abstract Scope |
In a binder jetting process, binder droplets are deposited on the powder bed to binder particles together for the printing purpose. The droplets can have rather high impacting speed, which can significantly disturb the powder bed and cause pores in the 3D printed parts. In this work, we will establish a 3D numerical model to capture this complex process. Specifically, a computational fluid dynamic (CFD) module will be developed to simulate the binder flow and droplet deformation, and a discrete element module (DEM) will be developed to simulate the droplet-particle and particle-particle collision. The two modules will be fully coupled to predict the binder droplet impact on the powder bed and the resultant powder re-arrangement. Model-based parametric studies will be performed to investigate the droplet and jetting parameters on the powder bed. |