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Atomization and Sprays
Facteur d'impact: 1.737 Facteur d'impact sur 5 ans: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 2.2

ISSN Imprimer: 1044-5110
ISSN En ligne: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.2012006400
pages 757-775

LIQUID FILM DYNAMIC ON THE SPRAY IMPINGEMENT MODELING

Christian M. G. Rodrigues
Aerospace Sciences Department, University of Beira Interior, Rua Marques Avila e Bolama, 6201-001 Covilha, Portugal
Jorge M. M. Barata
Aerospace Sciences Department, University of Beira Interior, Rua Marques Avila e Bolama, 6201-001 Covilha, Portugal
Andre R. R. Silva
Aerospace Sciences Department, University of Beira Interior, Rua Marques Avila e Bolama, 6201-001 Covilhã, Portugal

RÉSUMÉ

The present paper addresses a liquid film submodel included into a computational model that aims at reproducing the spray impingement phenomena. This numerical extension incorporates the spread of the liquid film over the neighboring nodes due to the dynamic motion induced by the film inertia and also the exchange of mass between the liquid layer and the incident and splashing particles. Moreover, a dimensionless film thickness parameter is embedded in the submodel by mean of an experimentally deduced correlation that can be fitted and updated to specified conditions. In order to realize how the model behaves with different influencing parameters, a thorough investigation is performed: the results that are obtained with and without the inclusion of the liquid film submodel are compared against the experimental data for two crossflow velocities. The integration of the computational extension with the spread/splash transition criterion is also evaluated by considering two types of expressions: one that includes the effect of the film thickness and one that does not. The results show that the latter option combined with the submodel does not distinctly enhance the simulation results, contrary to what happens with the transition criterion that considers the film thickness as an influencing parameter. In this case, the model with the computational extension reveals better prediction results, which indicates the necessity of considering it for spray impingement simulations along with a splash threshold that depends on the liquid layer.


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