Analysis of a textural atomization process

Christophe Dumouchel (1) , Jean-Bernard Blaisot (1) , Fakhry Abuzahra (1) , Akira Sou (2) , Gilles Godard (1) , Saïd Idlahcen (1)

1 CORIA - Complexe de recherche interprofessionnel en aérothermochimie
2 Kobe University

The experimental work reported in this paper addresses the question of the description of a textural atomization process including the atomizing structures and the resulting drops. Textural atomization process designates a deformation leading to drop-production localized on the liquid–gas interface of a liquid flow: droplets appear like peeled from the interface. Such a process usually takes place in the near field region, i.e., near the injector. In the present work, the textural atomization process of cavitating liquid flow is considered. A multiscale method is applied to describe this process and the concept of equivalent-system of cylinders is introduced and sued to provide a mathematical expression for it. In parallel, a mathematical formulation for the measured drop diameter-distribution is presented also. The connection between the atomization process and the spray is established on the basis of these mathematical formulations. It brings a model in which the main-drop diameter-distribution is controlled by the size distribution of the ligaments of the textural atomization process, and the satellite-drop peak links with their deformation. This analysis demonstrates that the scales for which the successive derivatives of the scale distribution are zero are characteristic lengths of the spray drop diameter distributions. These results have the potential to elaborate new simulation strategies for instance.

Domaines: Milieux fluides et réactifs; Mécanique des fluides [physics.class-ph]

Christophe Dumouchel, Jean-Bernard Blaisot, Fakhry Abuzahra, Akira Sou, Gilles Godard, et al.. Analysis of a textural atomization process. Experiments in Fluids, 2019, 60, ⟨10.1007/s00348-019-2780-8⟩. ⟨hal-02269659⟩