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Turbulent transfer and entrainment in a low-density jet

Published online by Cambridge University Press:  08 August 2023

P. Salizzoni Open the ORCID record for P. Salizzoni [Opens in a new window] ,
S. Vaux Open the ORCID record for S. Vaux [Opens in a new window] ,
M. Creyssels Open the ORCID record for M. Creyssels [Opens in a new window] ,
M. Amielh ,
L. Pietri  and
F. Anselmet Open the ORCID record for F. Anselmet [Opens in a new window]
P. Salizzoni*
Affiliation:
Laboratoire de Mécanique des Fluides et d'Acoustique, University of Lyon, CNRS UMR 5509 Ecole Centrale de Lyon, INSA Lyon, Université Claude Bernard, 36, avenue Guy de Collongue, 69134 Ecully, France Department of Environmental, Land, and Infrastructure Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy
S. Vaux
Affiliation:
Institut de Radioprotection et de Sûreté Nucléaire (IRSN), PSN-RES, SA2I, LIE, Cadarache, 13115 St Paul-Lez-Durance, France
M. Creyssels
Affiliation:
Laboratoire de Mécanique des Fluides et d'Acoustique, University of Lyon, CNRS UMR 5509 Ecole Centrale de Lyon, INSA Lyon, Université Claude Bernard, 36, avenue Guy de Collongue, 69134 Ecully, France
M. Amielh
Affiliation:
Aix Marseille University, CNRS, Centrale Marseille, IRPHE UMR 7342, 49, rue Frédéric Joliot-Curie, BP 146, 13384 Marseille Cedex 13, France
L. Pietri
Affiliation:
Aix Marseille University, CNRS, Centrale Marseille, IRPHE UMR 7342, 49, rue Frédéric Joliot-Curie, BP 146, 13384 Marseille Cedex 13, France
F. Anselmet
Affiliation:
Aix Marseille University, CNRS, Centrale Marseille, IRPHE UMR 7342, 49, rue Frédéric Joliot-Curie, BP 146, 13384 Marseille Cedex 13, France
*
†Email address for correspondence: pietro.salizzoni@ec-lyon.fr
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Abstract

We investigate the dynamics of a low-density round jet, with a focus on the mechanisms governing the turbulent momentum and mass transfers as well as on the entrainment of ambient fluid. To that purpose, we combine a theoretical analysis, laboratory experiments and numerical simulations. The theoretical analysis relies on a general formulation of the entrainment decomposition for the case of large density differences, revealing the role of the processes contributing to the entrainment: turbulent kinetic energy production and variation in the shape of the mean velocity radial profiles. The spatial evolution of these terms has been evaluated by means of challenging experiments, providing a unique data set of combined velocity and density statistics of a low-density jet and an air jet. The same flows are investigated by means of large-eddy simulation (LES). Other than for providing complementary information on flow statistics, LES is here used to investigate the role of varying conditions imposed at the source, notably concerning the shape of the inlet velocity profile and the presence of a bottom wall surrounding the source. Experimental and numerical results provide clear insight on how a reduced density within the jet enhances the turbulent kinetic energy production (compared to an iso-density jet) and modifies the shape of the mean velocity profiles. Despite its clear influence on the flow statistics, the reduced density has overall little influence on the entrainment rate, which also shows little sensitivity to varying source conditions.

JFM classification

Mixing: Turbulent mixing Turbulent Flows: Shear layer turbulence Wakes/Jets: Buoyant jets
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 968 , 10 August 2023 , A27
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Copyright
© The Author(s), 2023. Published by Cambridge University Press

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