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Scalar mixing and strain dynamics methodologies for PIV/LIF measurements of vortex ring flows

Bouremel, Y; Ducci, A; (2017) Scalar mixing and strain dynamics methodologies for PIV/LIF measurements of vortex ring flows. Physics of Fluids , 29 (1) , Article 013602. 10.1063/1.4973822. Green open access

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Abstract

Fluid mixing operations are central to possibly all chemical, petrochemical, and pharmaceutical industries either being related to biphasic blending in polymerisation processes, cell suspension for biopharmaceuticals production, and fractionation of complex oil mixtures. This work aims at providing a fundamental understanding of the mixing and stretching dynamics occurring in a reactor in the presence of a vortical structure, and the vortex ring was selected as a flow paradigm of vortices commonly encountered in stirred and shaken reactors in laminar flow conditions. High resolution laser induced fluorescence and particle imaging velocimetry measurements were carried out to fully resolve the flow dissipative scales and provide a complete data set to fully assess macro- and micro-mixing characteristics. The analysis builds upon the Lamb-Oseen vortex work of Meunier and Villermaux [“How vortices mix,” J. Fluid Mech. 476, 213–222 (2003)] and the engulfment model of Baldyga and Bourne [“Simplification of micromixing calculations. I. Derivation and application of new model,” Chem. Eng. J. 42, 83–92 (1989); “Simplification of micromixing calculations. II. New applications,” ibid. 42, 93–101 (1989)] which are valid for diffusion-free conditions, and a comparison is made between three methodologies to assess mixing characteristics. The first method is commonly used in macro-mixing studies and is based on a control area analysis by estimating the variation in time of the concentration standard deviation, while the other two are formulated to provide an insight into local segregation dynamics, by either using an iso-concentration approach or an iso-concentration gradient approach to take into account diffusion.

Type: Article
Title: Scalar mixing and strain dynamics methodologies for PIV/LIF measurements of vortex ring flows
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.4973822
Publisher version: http://dx.doi.org/10.1063/1.4973822
Language: English
Additional information: The following article appeared in: Bouremel, Y; Ducci, A; (2017) Scalar mixing and strain dynamics methodologies for PIV/LIF measurements of vortex ring flows. Physics of Fluids, 29 (1), Article 013602, and may be found at: http://dx.doi.org/10.1063/1.4973822. This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.
Keywords: Vortex rings, Rotating flows, Laser induced fluorescence, Diffusion, Velocimetry
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Ophthalmology
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1538785
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