Direct numerical simulations of a single drop in bag mode break-up

• Autores: Pairetti, César I.; Márquez Damián, Santiago; Nigro, Norberto M.; Zaleski, Stéphane
• Año de publicación: 2017
• Idioma: inglés
• Tipo de recurso: documento de conferencia
• Materia: Ingeniería; Atomization; Drops; Break-up; Basilisk
• Institución: Universidad Nacional de La Plata

Secondary break-up consist on the decomposition of droplets, ligaments and rims into smaller droplets forming a spray. This phenomenon is driven by interface deformation given by the growth of hy- drodynamic instabilities, depending on Reynolds andWeber numbers. Bag mode break-up takes place at moderate gas Weber numbers, at which the drops turns into a film and inflates. Film thickness decreases until a hole forms and expands, giving place to decomposition in smaller droplets. This mechanism is present in several break-up processes and is of great interest to understand the underlying physics of liquid atomization. In this work, we present the Direct Numerical Simulations (DNS) results of a single liquid droplet submerged in an air stream in bag mode regime. Navier-Stokes equations for the two-phase flow are solved using a Volume of Fluid with a Piecewise Linear Interface Capturing (PLIC) formulation and geometrical advection schemes on the volume fraction and momentum equations, programmed in the Basilisk suite. The deformation of the drop into a film and the posterior evolution of its thickness is studied until the formation of a hole and the results are compared with experimental data.
Publicado en: Mecánica Computacional vol. XXXV, no. 19
Facultad de Ingeniería