Abstract
Numerical simulation of the droplet formation process from the liquid round jet in a Capillary ink jet printer has been conducted. The VOF method along with the continuous surface tension model was applied to calculate the fluid interface. The disturbance derived from the Rayleigh's linear theory was added to the initial jet velocity. In the small surface tension case, nearly uniform droplet was formed in each disturbance cycle. In the large surface tension case, the droplets formed in each disturbance cycle further merge to large droplets.
