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Atomization by jet impact

Published online by Cambridge University Press:  08 February 2006

N. BREMOND  and
E. VILLERMAUX
N. BREMOND
Affiliation:
IRPHE, Université de Provence, Aix–Marseille I, Technopôle de Château-Gombert, 49, rue Frédéric Joliot-Curie 13384 Marseille Cedex 13, France
E. VILLERMAUX
Affiliation:
IRPHE, Université de Provence, Aix–Marseille I, Technopôle de Château-Gombert, 49, rue Frédéric Joliot-Curie 13384 Marseille Cedex 13, France
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Abstract

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The formation and fragmentation of liquid sheets resulting from the oblique collision of two identical cylindrical jets is investigated. The liquid expands radially from the impacting point forming a sheet in the form of a bay leaf bounded by a thicker rim. The sheet shape, rim size and liquid velocity field are quantified and represented analytically. External harmonic perturbations of the injection conditions reveal the nature of the rim destabilization and of its coupling with the sheet. Flow perturbations in the incident jets lead to sheet thickness modulations which trigger the fragmentation of the rim via the formation of liquid ligaments whose dynamics is described. The breakup of these ligaments induce both the shape and width of the drop size distribution in the spray formed by this process.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 549 , 25 February 2006 , pp. 273 - 306
Copyright
© 2006 Cambridge University Press