Abstract
An improved Taylor analogy breakup (TAB) model been proposed for more accurate prediction of the deformation and breakup of a spray. Especially, the effects of the droplet deformation on the droplet aerodynamic external force are considered in this model, which was neglected in the TAB model. It is found that the predicted droplet deformation using the present improved TAB model shows better agreement with experimental data than those of other models for the droplets in both bag-type and shear-type breakup regimes. A new breakup criterion has been proposed to predict more reasonable breakup quantities, such as breakup deformation length and breakup time; it is defined that the breakup occurs when the internal liquid-phase pressure of the deformed droplet at the equator is greater than that at the pole. The proposed breakup criterion shows more physical relationship between the degree of droplet deformation at breakup and the corresponding breakup Weber number as compared with the results using the TAB and the droplet deformation (DDB) models. Therefore, it provides better predictions of the experimental data than the TAB and DDB models for the droplet deformation and breakup time in both the bag-type and shear-type breakup regimes.
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