Numerical simulation of mass transfer and fluid flow evolution of a rectangular free jet of air

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dc.contributor.authorDi Venuta, Ivan
dc.contributor.authorPetracci, Ivano
dc.contributor.authorAngelino, Matteo
dc.contributor.authorBoghi, Andrea
dc.contributor.authorGori, Fabio
dc.date.accessioned2017-10-30T18:34:11Z
dc.date.available2017-10-30T18:34:11Z
dc.date.issued2017-10-12
dc.description.abstractThe paper presents Large Eddy Simulations (LES) of mass transfer and fluid flow evolutions of a submerged rectangular free jet of air in the range of Reynolds numbers from Re = 3400 to Re = 22,000, with the Reynolds number, Re, defined with the hydraulic diameter of the rectangular slot, of height H. The numerical simulations are 3D for Re = 3400 and 6800, while 2D for Re = 10,400 and 22,000 to reduce computational time costs. The average and instant LES numerical simulations are compared with the concentration visualizations, obtained with the Particle Image Velocimetry (PIV) technique, and the fluid dynamics variables, velocity and turbulence, measured with the PIV technique and the Hot Film Anemometry (HFA). In the numerical simulations, the Schmidt number is equal to 100 to compare the air concentration in the PIV experiments, while the turbulence on the exit of the slot is equal to the value measured experimentally, and ranging between 1% and 2%. The average 2-3D LES simulations are in agreement with the concentration and the fluid dynamics experimental results in the Undisturbed Region of Flow (URF) and in the Potential Core Region (PCR), while the vortex breakdown is captured only by the 3D LES approach. As far as the instant flow evolution is concerned, the 2-3D LES simulations reproduce the Negligible Disturbances Flow (NDF), where the jet height maintains constant, and the Small Disturbances Flow (SDF), where the jet height oscillates, with contractions and enlargements, but without the vortex formation. Average and instant velocity and turbulence numerical simulations on the centreline are in good agreement to the experimental PIV measurements.en_UK
dc.identifier.citationDi Venuta I, Petracci I, Angelino M, Boghi A, Gori F, Numerical simulation of mass transfer and fluid flow evolution of a rectangular free jet of air, International Journal of Heat and Mass Transfer, Volume, 117, February 2018, pp. 235-251en_UK
dc.identifier.issn0017-9310
dc.identifier.urihttp://dx.doi.org/10.1016/j.ijheatmasstransfer.2017.10.030
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/12685
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.subject2-3D Large Eddy Simulationsen_UK
dc.subjectTransitional to turbulent flowen_UK
dc.subjectNumerical concentration and velocity fields compared to PIV visualizationsen_UK
dc.subjectNumerical fluid dynamics variables compared to HFA measurementsen_UK
dc.subjectConfirm of URF in average flow and NDFen_UK
dc.subjectSDF in instant flowen_UK
dc.titleNumerical simulation of mass transfer and fluid flow evolution of a rectangular free jet of airen_UK
dc.typeArticleen_UK

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