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Atomization and Sprays
Factor de Impacto: 1.262 Factor de Impacto de 5 años: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN En Línea: 1936-2684

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Atomization and Sprays

DOI: 10.1615/AtomizSpr.v7.i6.10
pages 561-579

THE STRUCTURE OF AN ACOUSTICALLY FORCED, DROPLET-LADEN JET

Tait R. Swanson
School of Mechanical & Materials Engineering, Washington State University, Pullman, Washington, USA
Cill D. Richards
School of Mechanical & Materials Engineering, Washington State University, Pullman, Washington, USA

SINOPSIS

A detailed characterization of the interaction of a polydisperse spray with large-scale vortical structures in a jet is presented. Phase Doppler interferometry is used to acquire droplet size and velocity information. Planar imaging techniques are applied to document the distribution of droplets and their number density within structures. The presence of large-scale structures results in large local variations of droplet number density. Images taken through the cross section of a large-scale structure provide evidence that azimuthal structures contribute to the dispersion of droplets. Size measurements show that, in general, only droplets with Stokes number less than unity are found on the outer edge of vortical structures. However, even for very small droplets (Stokes number < 0.1), a substantial portion of the vortex center is void of droplets. Radial velocity measurements show that droplets have an outward radial velocity on the leading edges and an inward radial velocity on the trailing edges of structures. Axial velocity measurements show complex size-velocity correlations within structures among different droplet size classes. Size-velocity correlations become less distinct across the jet due to the transport of droplets by large-scale vortical structures.