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Atomization and Sprays

Impact factor: 1.235

ISSN Print: 1044-5110
ISSN Online: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v10.i3-5.80
pages 387-408

MODELING OF SPRAY IMPACT ON SOLID SURFACES

Cameron Tropea
Technische Universität Darmstadt, Institute of Fluid Mechanics and Aerodynamics, Center of Smart Interfaces, International Research Training Group Darmstadt-Tokyo on Mathematical Fluid Dynamics, Germany
Ilia V. Roisman
Technische Universität Darmstadt, Institute of Fluid Mechanics and Aerodynamics, Center of Smart Interfaces, Germany

ABSTRACT

This work presented in this article differs from conventional approaches in modeling spray impact on walls and films by departing from the idea that results obtained from single drop impacts can be simply extrapolated to the case of sprays. An empirical model of spray impact on solid surfaces accounting for the interaction of neighboring impacts is proposed. Propagation of a crown resulting from the impact of a single drop is analyzed theoretically, and a statistical parameter λ, characterizing the occurrence probability of crown interactions on the surface, is estimated. Then, the model for single drop impacts is corrected using the parameter λ to fit the experimental results of spray impact. A simple form of the probability density function of the secondary droplets is proposed, and analytical expressions for its parameters are given. It is also shown experimentally that the behavior of the spray at a given point near the solid surface can be influenced by conditions far from this point.