TAB Droplet Breakup Model Reference

The Taylor Analogy Breakup (TAB) breakup model is an extension of the TAB distortion model which assumes that breakup occurs when the droplet distortion reaches a prescribed magnitude.

The TAB model begins with the assumption that breakup occurs when the TAB distortion, as calculated by the TAB distortion model, exceeds unity. Breakup replaces the parent particles with child particles whose diameter is chosen from a Rosin-Rammler distribution. By default, the breakup event creates no parcels—the original parcel is retained, but the particle diameter changes to the new child value. New parcels can optionally be created however, in which case the droplet diameter in each is chosen independently. This feature can be useful in modeling the generation of a distribution of droplet sizes through breakup. Parcels that are involved in a breakup event are given a lateral velocity proportional to the kinetic energy of the droplet oscillation at the instant of breakup. This velocity tends to generate a spreading effect from an injector which, to some extent, makes a cone injector unnecessary.

Despite being based on a single mode of oscillation in the vibrational regime, the TAB model reproduces the same characteristic time-scales in low and high Weber number limits as the Reitz-Diwakar model. Typically, however, the TAB model is used at low Weber numbers; hollow-cone gasoline sprays are an example of a preferred application for this model [647]. Outside its range of validity, the model tends to underpredict droplet sizes.