Effect of liquid viscosity on the aerodynamic breakup of non-spherical droplets

Abstract

[EN] This paper studies the effect of liquid viscosity on the atomisation regimes of initially spherical and non-spherical droplets and also kinematic characteristics of non-spherical droplets. The droplets consisted of water-glycerol solutions with viscosities ranging from 6.3 to 697 mPa s, and the initial aspect ratio was 1<AR<2. The range of W e number was from 10 to 200 and of the Oh number from 0.01 to approximately 4. The experimental findings showed that the equivalent W eeq and Oheq numbers, proposed in previous work [1] for water droplets, are also applicable to spherical and non-spherical droplets in the range of Oh numbers of this study in order to classify the breakup regimes on the existing morphological charts. The kinematic characteristics of the centre of mass for droplets with AR=1.2 are evaluated and the role of viscosity examined in the no breakup and bag-stamen regimes.