Influences of disturbance frequency on the droplet generation for microdroplet deposition manufacture

Abstract

The influences of the disturbance frequency on the metal droplet generation are investigated for microdroplet deposition manufacture. The polynomial distribution model is assumed for the jet velocity profile. The optimal disturbance frequency is predicted according to the linear stability analysis. The jet velocity converges and the uniform droplets are generated at the optimal disturbance frequency in the simulation. Experiments have been conducted with the orifice diameter of 150 mm. The formation and diameter of Sn60/Pb40 droplets are estimated under the actions of the different frequency. Results show that the accuracy of the droplet shape and diameter are improved. A narrow-sized log-normal distribution is obtained and the diameter deviation is about 2.59 per cent at the optimal disturbance frequency of 3.89 kHz. Good agreements between the theoretical predictions and experimental values indicate that the optimal disturbance frequency is well predicted with a frequency deviation of less than 1.03 per cent. These works are useful when selecting the operating parameters for manufacturing.

Effect of Superimposed Vibrations on Droplet Oscillation Modes in Prilling Process

“…As a result, it is theoretically and experimentally confirmed that there are inherent transverse oscillations in the jet by changing the radial velocity component. Similar studies on the effect of oscillation frequency on the stability of the droplet shape [26] and its monodispersity [27] are additionally presented in the works [28,29].…”

Deposition manufacturing of three-dimensional objects by spraying the metal droplets

“…The part was fabricated with the UDS method showed a 30 percent improvement the Mechanical property in ultimate tensile strength compared to raw stock. Northwestern Polytechnical University [6,7] also has done some researches with UDS. But this technique produces a continuous stream of droplets at very high frequencies (4~20 KHz), which makes this method difficult to control.…”