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Intermittency in turbulent emulsions
INFN, Sez Torino, via Pietro Giuria 1, I-10125 Turin, Italy..
Univ Torino, Dipartimento Fis, via P Giuria 1, I-10125 Turin, Italy..
KTH, School of Engineering Sciences (SCI), Centres, Linné Flow Center, FLOW. KTH, School of Engineering Sciences (SCI), Engineering Mechanics, Fluid Mechanics and Engineering Acoustics. Norwegian Univ Sci & Technol NTNU, Dept Energy & Proc Engn, Trondheim, Norway..ORCID iD: 0000-0002-4346-4732
Univ Paris Saclay, CNRS, LISN, Saclay F-91400, France..
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2023 (English)In: Journal of Fluid Mechanics, ISSN 0022-1120, E-ISSN 1469-7645, Vol. 972, article id A37Article in journal (Refereed) Published
Abstract [en]

We investigate the statistics of turbulence in emulsions of two immiscible fluids of the same density. We compute velocity increments between points conditioned to be located in the same phase or in different phases, and examine their probability density functions (PDFs) and the associated structure functions (SFs). This enables us to demonstrate that the presence of the interface reduces the skewness of the PDF at small scales and therefore the magnitude of the energy flux towards the dissipative scales, which is quantified by the third-order SF. The analysis of the higher-order SFs shows that multiphase turbulence is more intermittent than single-phase turbulence. In particular, the local scaling exponents of the SFs display a saturation below the Kolmogorov-Hinze scale, which indicates the presence of large velocity gradients across the interface. Interestingly, the statistics of the velocity differences in the carrier phase recovers that of single-phase turbulence when the viscosity of the dispersed phase is high.

Place, publisher, year, edition, pages
Cambridge University Press (CUP) , 2023. Vol. 972, article id A37
Keywords [en]
multiphase flow, intermittency
National Category
Fluid Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-339359DOI: 10.1017/jfm.2023.628ISI: 001079232800001Scopus ID: 2-s2.0-85175266691OAI: oai:DiVA.org:kth-339359DiVA, id: diva2:1810547
Note

QC 20231108

Available from: 2023-11-08 Created: 2023-11-08 Last updated: 2025-02-09Bibliographically approved

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Brandt, Luca

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