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

Published online by Cambridge University Press:  09 December 2021

P.D. Huck Open the ORCID record for P.D. Huck [Opens in a new window] ,
R. Osuna-Orozco ,
N. Machicoane Open the ORCID record for N. Machicoane [Opens in a new window]  and
A. Aliseda Open the ORCID record for A. Aliseda [Opens in a new window]
P.D. Huck
Affiliation:
Department of Mechanical Engineering, University of Washington, Seattle, WA, 98195, USA
R. Osuna-Orozco
Affiliation:
Department of Mechanical Engineering, University of Washington, Seattle, WA, 98195, USA
N. Machicoane
Affiliation:
Department of Mechanical Engineering, University of Washington, Seattle, WA, 98195, USA University of Grenoble Alpes, CNRS, Grenoble INP, LEGI, 38000 Grenoble, France
A. Aliseda*
Affiliation:
Department of Mechanical Engineering, University of Washington, Seattle, WA, 98195, USA
*
†Email address for correspondence: [email protected]
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Abstract

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, $St=\tau _p/T_E=1.9$, formulated based on the local Eulerian large scale eddy turnover time, $T_E$, and the droplets’ response time, $\tau _p$. A two-dimensional phase space summarizes the extent of these different regimes in the context of spray characteristics found in the literature.

JFM classification

Multiphase and Particle-laden Flows: Multiphase flow Multiphase and Particle-laden Flows: Particle/fluid flow Drops and Bubbles: Aerosols/atomization
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 932 , 10 February 2022 , A36
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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