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Article Dans Une Revue Journal of Fluid Mechanics Année : 2021

Spray dispersion regimes following atomization in a turbulent co-axial gas jet

Résumé

A canonical co-axial round-jet two-fluid atomizer where atomization occurs over a wide range of momentum ratios: M = 1.9-376.4 is studied. The near field of the spray, where the droplet formation process takes place, is characterized and linked to droplet dispersion in the far field of the jet. Counterintuitively, our results indicate that in the low-momentum regime, increasing the momentum in the gas phase leads to less droplet dispersion. A critical momentum ratio of the order of M c = 50, that separates this regime from a high-momentum one with less dispersion, is found in both the near and far fields. A phenomenological model is proposed that determines the susceptibility of droplets to disperse beyond the nominal extent of the gas phase based on a critical Stokes number, St = τ p /T E = 1.9, formulated based on the local Eulerian large scale eddy turnover time, T E , and the droplets' response time, τ p. A two-dimensional phase space summarizes the extent of these different regimes in the context of spray characteristics found in the literature.
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Dates et versions

hal-03482002 , version 1 (13-01-2022)

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P D Huck, R Osuna-Orozco, Nathanaël Machicoane, A Aliseda. Spray dispersion regimes following atomization in a turbulent co-axial gas jet. Journal of Fluid Mechanics, 2021, 932, pp.A36. ⟨10.1017/jfm.2021.992⟩. ⟨hal-03482002⟩

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