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Modeling liquid break-up through a kinetic approach

Journal Article
ISSN: 1946-3936, e-ISSN: 1946-3944
Published September 13, 2009 by Consiglio Nazionale delle Ricerche in Italy
Modeling liquid break-up through a kinetic approach
Citation: Bella, G., Chiappini, D., and Ubertini, S., "Modeling liquid break-up through a kinetic approach," SAE Int. J. Engines 2(2):390-399, 2010,
Language: English


Liquid atomisation is an important technical field for a wide range of engineering and industrial applications, particularly in the field of internal combustion engines. In these engines, in fact, the amount of pollutants at the engine-out interface is directly related to the quality of the combustion process, which is in turn determined by the quality of the air-fuel mixture preparation in Direct Injection (DI) engines. As a consequence numerical-experimental research is crucial to their development. Despite the significant amount of research that has been carried out on DI engines simulation, breakup modelling is still a challenge.
In this paper we present a new numerical model for multiphase flows that could be particularly suited for liquid jet and droplet breakup simulation. The model is based on a Lattice Boltzmann (LB) solver coupled to a higher order finite difference treatment of the kinetic forces arising from non-ideal interactions (potential energy). Direct comparisons with literature data for Rayleigh Taylor instability on a liquid jet and single droplet breakup are presented.
The analysis on the single droplet allows highlighting different regimes of secondary break-up of a liquid drop immersed in a continuous medium under the influence of a gravitational force.