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  Physical mechanisms governing drag reduction in turbulent Taylor-Couette flow with finite-size deformable bubbles

Spandan, V., Verzicco, R., & Lohse, D. (2018). Physical mechanisms governing drag reduction in turbulent Taylor-Couette flow with finite-size deformable bubbles. Journal of Fluid Mechanics, 849: R3. doi:10.1017/jfm.2018.478.

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 Urheber:
Spandan, V., Autor
Verzicco, R., Autor
Lohse, Detlef1, Autor           
Affiliations:
1Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063285              

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Schlagwörter: multiphase and particle-laden flows; multiphase flow; Taylor-Couette flow
 Zusammenfassung: The phenomenon of drag reduction induced by injection of bubbles into a turbulent carrier fluid has been known for a long time; the governing control parameters and underlying physics is, however, not well understood. In this paper, we use three-dimensional numerical simulations to uncover the effect of deformability of bubbles injected in a turbulent Taylor-Couette flow on the overall drag experienced by the system. We consider two different Reynolds numbers for the carrier flow, i.e. Re-i = 5 x 10(3) and Re-i = 2 x 10(4) ; the deformability of the bubbles is controlled through the Weber number, which is varied in the range We=0.01-2.0. Our numerical simulations show that increasing the deformability of bubbles (that is, We) leads to an increase in drag reduction. We look at the different physical effects contributing to drag reduction and analyse their individual contributions with increasing bubble deformability. Profiles of local angular velocity flux show that, in the presence of bubbles, turbulence is enhanced near the inner cylinder while attenuated in the bulk and near the outer cylinder. We connect the increase in drag reduction to the decrease in dissipation in the wake of highly deformed bubbles near the inner cylinder.

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Sprache(n): eng - English
 Datum: 2018-06-272018-08-25
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: DOI: 10.1017/jfm.2018.478
 Art des Abschluß: -

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Titel: Journal of Fluid Mechanics
Genre der Quelle: Zeitschrift
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Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: 13 Band / Heft: 849 Artikelnummer: R3 Start- / Endseite: - Identifikator: -