Weber number breakup criterion

Isolated Droplet Breakup—in a Velocity Field Much effort has focused on defining the conditions under which an isolated drop will break in a velocity field. The criterion for the largest stable drop size is the ratio of aerodynamic forces to surface-tension forces defined by the Weber number, N (dimensionless). 

Dealing with the breakup of fluids resulting in the formation of bnbbles or drops the Weber number is the decisive criterion The stability of fluid particles can be described by a certain value of this number as will be shown later. 

In addition to the critical Weber number for a drop-on-demand breakup, the criterion of We > 8 for a Rayleigh breakup has also been reported [16]. This limit can also be motivated by the lower limit of jet formation in the case of dripping out of a vertical capillary with diameter Dnozzis under the action of gravity. The static pressure pstat inside a hanging droplet is... 

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