Numerical research of high viscosity phosphor flow field distribution of high-power LED phosphor coating process

In this paper, the transportation and atomization of phosphor glue flowing in high-power LED (Light Emitting Diode) phosphor coating process were investigated via CFD (Computational Fluid Dynamics) and numerical simulations, and the 3D flow field models as well as the mathematical models of phosphor were established to describe the velocity distribution of phosphor glue´s flow field between two different spraying guns. Moreover, spraying experiments were carried out, and the consistency of simulated results with experimental ones was proved. It is found that numerical simulation helps accurately predict the phosphor droplets trajectories and the velocity distribution in LED phosphor coating process without establishing any models of atomization process; and that, within the same spray distance, small phosphor droplet and high droplet velocity may result in short acceleration and deceleration distance.