TAB 모델과 수정된 액적 항력 모델을 이용한 공기 보조 분무 액적 분열에 대한 수치적 연구

Abstract

The aim of this article is to perform the numerical simulation for drop drag and breakup processes in airassisted sprays using the Taylor analogy breakup (TAB) model with a modified drop drag model, in which a random method is newly used to consider the variation of the drop's frontal area. The predicted results for drop trajectory and Sauter mean diameter (SMD) were compared with experimental data and the simulation results using the earlier published models such as TAB model, surface wave instability (Wave) model, and Wave model with original drop drag model. In addition, the effects of the breakup model constant, Ck, on prediction of spray behaviors were discussed. The results shows that the TAB model with the modified drop drag model is in better agreement with experimental data than the other models, indicating the present model is acceptable for predicting the drop breakup process in air-assisted sprays. At higher Weber numbers, the smaller Ck shows the best fitting to experimental data. It should be noted that more elaborated studies is required in order to determine the breakup model constant in the suggested model in the study.