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Passive scalar diffusion in the near field region of turbulent rectangular submerged free jets

Passive scalar diffusion in the near field region of turbulent rectangular submerged free jets
Passive scalar diffusion in the near field region of turbulent rectangular submerged free jets

Jets are a common way to transfer mass among fluids, or from a fluid to a surface. At moderate Reynolds numbers and low turbulent intensities the jet exhibits a Near Field Region (NFR) several diameters long. The paper presents numerical results and a theoretical model for the passive scalar diffusion of a submerged free jet in the NFR. Large Eddy Simulations (LES), in the Reynolds number range of 5000–40,000 and the Schmidt number range 1–100, are performed obtaining the passive scalar fields. Three mathematical models for the passive scalar diffusion are presented; the first one is valid in the NFR, specifically in the Undisturbed Region of Flow (URF), and the other two, obtained under the hypotheses of Tollmien and Görtler momentum spreading, are valid in the Potential Core Region (PCR). The last two models employ a turbulent Schmidt number inversely proportional to the mean velocity gradient, conclusion obtained from the LES numerical results. The self-similar solutions of the passive scalar show good agreement with the LES results. The wide range of Reynolds and Schmidt numbers investigated gives generality to the results.

Large eddy simulation, Near field region, Negligible disturbances flow, Passive scalar, Self-similarity, Small disturbances flow, Submerged rectangular free jet, Turbulent flow, Undisturbed region of flow
0017-9310
1017-1031
Boghi, Andrea
54a72da6-c8a2-468c-9773-897efac0638f
Di Venuta, Ivan
c478ec72-9e42-45cd-9afb-147f93b6835b
Gori, Fabio
f7e76614-37d8-4c3b-b7b0-8c6603a4515f
Boghi, Andrea
54a72da6-c8a2-468c-9773-897efac0638f
Di Venuta, Ivan
c478ec72-9e42-45cd-9afb-147f93b6835b
Gori, Fabio
f7e76614-37d8-4c3b-b7b0-8c6603a4515f

Boghi, Andrea, Di Venuta, Ivan and Gori, Fabio (2017) Passive scalar diffusion in the near field region of turbulent rectangular submerged free jets. International Journal of Heat and Mass Transfer, 112, 1017-1031. (doi:10.1016/j.ijheatmasstransfer.2017.05.038).

Record type: Article

Abstract

Jets are a common way to transfer mass among fluids, or from a fluid to a surface. At moderate Reynolds numbers and low turbulent intensities the jet exhibits a Near Field Region (NFR) several diameters long. The paper presents numerical results and a theoretical model for the passive scalar diffusion of a submerged free jet in the NFR. Large Eddy Simulations (LES), in the Reynolds number range of 5000–40,000 and the Schmidt number range 1–100, are performed obtaining the passive scalar fields. Three mathematical models for the passive scalar diffusion are presented; the first one is valid in the NFR, specifically in the Undisturbed Region of Flow (URF), and the other two, obtained under the hypotheses of Tollmien and Görtler momentum spreading, are valid in the Potential Core Region (PCR). The last two models employ a turbulent Schmidt number inversely proportional to the mean velocity gradient, conclusion obtained from the LES numerical results. The self-similar solutions of the passive scalar show good agreement with the LES results. The wide range of Reynolds and Schmidt numbers investigated gives generality to the results.

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More information

Accepted/In Press date: 10 May 2017
e-pub ahead of print date: 19 May 2017
Published date: September 2017
Keywords: Large eddy simulation, Near field region, Negligible disturbances flow, Passive scalar, Self-similarity, Small disturbances flow, Submerged rectangular free jet, Turbulent flow, Undisturbed region of flow

Identifiers

Local EPrints ID: 421758
URI: https://eprints.soton.ac.uk/id/eprint/421758
ISSN: 0017-9310
PURE UUID: d7ee2274-254a-49b4-a9f9-22ff0a007f91
ORCID for Andrea Boghi: ORCID iD orcid.org/0000-0002-9387-326X

Catalogue record

Date deposited: 26 Jun 2018 16:30
Last modified: 20 Jul 2019 01:33

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Contributors

Author: Andrea Boghi ORCID iD
Author: Ivan Di Venuta
Author: Fabio Gori

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