Numerical Simulations Of Effervescent Atomization Processes

This paper is mainly about the numerical simulation related to atomization in fluid jet flow and atomization process with bubbles.Firstly, it simulates atomization in fluid jet flow both at low Weber’s number and High Weber number, and the results are compared with the data of former studies. The results show that, under the condition of low Weber number, aerodynamic force has only a minor effect on the atomization in fluid jet flow, which can be ignored, and the atomization in fluid jet flow is the result of interaction of surface tension, viscous force and gravity. Under the condition of high weber number, the effect can be great, and the disturbance and breakup of the surface of a fluid jet is closely related to the aerodynamic force. With the increase of the incidence rate, the area where the surface disturbance happens is not only limited to where about the head of the fluid jet, but also expanded to the whole fluid jet.Afterwards, the paper shows the further simulation of the atomization process with bubbles, in which both single bubble and multiple bubbles are considered. The data shows that, under the situation when the total area of bubbles is same, the effect of atomization with multiple bubbles is much better than with one single bubble. Secondary atomization and repeatedly atomization are likely to happen when with multiple bubbles, and the multiple bubbles apply to a longer fluid jet. The atomization does not only cause the breakup of the liquid around, but the movement of air can also affect the front and the back, which increase the disturbance of the surface, and then results in the drop of liquid on the surface.