Atomization and Sprays Journal of the International Institutes for Liquid Atomization and Spray Systems

ISSN for PRINT: 1045-5110

For Online Access

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2000, Volume10

Issue 6

132 pages

Issue price - $75.00

M. de Vega
Area de Ingenieria Termica. E.P.S. Universidad Carlos III de Madrid, Madrid Spain

P. Rodriguez
Unidad Asociada de Ingenieria Termicay de Fluidos CSIC-UC3M; Departamento de Ingenieria Termicay de Fluidos, Universidad Carlos III de Madrid, Avda. Universidad, 30, 28911 Leganes, Madrid, Spain

A. Lecuona
Area de Ingenieria Termica. E.P.S. Universidad Carlos III de Madrid, Madrid Spain

The far-field turbulent structure of an airblast coaxial spray without swirl has been studied using a two-velocity-component phase Doppler anemometer. Size, velocity, and droplet number density have been measured at nine different locations from the injection plane. The measurements have been checked against an extinction sensor. Deceleration has been studied and compared with other experiments in coaxial sprays, gaseous, and particle-laden jets. An expression, valid to describe the deceleration in coaxial sprays with a similar breakup mechanism, is proposed. Furthermore, five representative droplet families discriminated by their Stokes number have been selected to study differences in their dynamic evolution in the spray. Self-similar velocity profiles in the mean and turbulent components have been obtained. In the axial component all droplets are seen to behave similarly, while significant differences are observed in the transverse velocity. Mean particle number density profiles are top-hat-shaped, while the highest number density of droplets with Stokes number near unity is placed at off-axis locations. The distribution of the volume flux has also been calculated.

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