Abstract
A novel method combining the harmonic mechanical excitation and micron-sized nozzle was proposed to prepare metal particles with micro size, good sphericity and narrow diameter distribution. A numerical model was developed to show more detailed information about the dynamic behaviours of the micron-sized metal droplet generation. The classical Rayleigh's jet linear instability theory and a Bernoulli equation were reviewed. The frequencies for uniform droplet production were predicted by using the classical linear instability with nozzle of diameters small down to 5μm and spray pressure up to several MPa. The simulation results also show that adjacent micron-sized droplets were too close and easy to merge with each other, indicating the droplet charging process was necessary to prevent droplets merging. The proposed method was hoped to develop into a novel micron-sized metal particles preparing method with high productivity and uniformity.
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