Topical Problems of Fluid Mechanics


Institute of Thermomechanics AS CR, v.v.i.	CTU in Prague Faculty of Mech. Engineering Dept. Tech. Mathematics	MIO Université du Sud Toulon Var - AMU - CNRS - IRD	Czech Pilot centre ERCOFTAC

Model for a Fluid Particle Breakup in a Turbulent Flow
M. Zedníková, J. Vejražka, P. Stanovský
Abstract:
A model is developed for predicting the outcome of breakup of a fluid particle (bubble or drop), which is initially deformed (e.g. due to turbulence) and breaks into two daughter particles. An initially dumbbell-shaped deformation of the particle is assumed. The evolution of sizes of particle sub-parts is calculated using Rayleigh-Plesset equations, which consider the inertia of surrounding fluid, capillary action and viscous effects. The redistribution of internal fluid in the particle is calculated using Bernoulli equation. The model computes the sizes of daughter particles after the breakup. By assuming various initial conditions (various initial shapes and initial velocities of deformation), the size distribution of daughter particles is obtained. These size distributions are qualitatively compared with available experimental data and reasonable agreement is observed. Because of strong assumptions, this model cannot be used directly for accurate prediction of size distribution after a breakup. However, it provides an insight in the physics of the breakup, especially on the effect of inner phase properties.
Keywords:
bubble breakup, drop breakup, turbulent flow, breakup model

Fulltext: PDF DOI: https://doi.org/10.14311/TPFM.2017.042

In Proceedings Topical Problems of Fluid Mechanics 2017, Prague, 2017 Edited by David Šimurda and Tomáš Bodnár, pp. 337-342 ISBN 978-80-87012-61-1 (Print) ISSN 2336-5781 (Print)