Abstract
In the present study, the variation of microbble radius under a high heat flux is investigated and a simulated bubble is developed by the commercial software, CFD-ACE (U), using a blow-suction method. The radius of microbubble is calculated by the extended Rayleigh equation with Asai's pressure approximation(Asai, 1991) and the results was fitted by the cubic spline method to be the input data of the simulated bubble. Finally, a series of studies of the droplet behavior are conducted with various different sizes of ink chambers and nozzles. Moreover the temperature effect was also discussed. The results demonstrate that a good agreement in the early stage of bubble expansion between the extended Rayleigh equation and the experimental data. This simulated bubble volume is nearly coincided with the input bubble volume. Based on the results from the simulation, the droplet velocity is found to decrease with an increase nozzle size and chamber height, and the droplet volume increases with increase of the nozzle size. However, the temperature effect is insignificant.