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

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dc.contributor.authorBoghi, Andrea
dc.contributor.authorDi Venuta, Ivan
dc.contributor.authorGori, Fabio
dc.date.accessioned2017-06-07T09:22:52Z
dc.date.available2017-06-07T09:22:52Z
dc.date.issued2017-05-19
dc.description.abstractJets 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.en_UK
dc.identifier.citationAndrea Boghi, Ivan Di Venuta, Fabio Gori, Passive scalar diffusion in the near field region of turbulent rectangular submerged free jets, International Journal of Heat and Mass Transfer, Volume 112, September 2017, Pages 1017-1031en_UK
dc.identifier.issn0017-9310
dc.identifier.urihttp://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.05.038
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/11981
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectSubmerged rectangular free jeten_UK
dc.subjectTurbulent flowen_UK
dc.subjectNear field regionen_UK
dc.subjectUndisturbed region of flowen_UK
dc.subjectNegligible disturbances flowen_UK
dc.subjectSmall disturbances flowen_UK
dc.subjectPassive scalaren_UK
dc.subjectLarge eddy simulationen_UK
dc.subjectSelf-similarityen_UK
dc.titlePassive scalar diffusion in the near field region of turbulent rectangular submerged free jetsen_UK
dc.typeArticleen_UK

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