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The interaction of droplet dynamics and turbulence cascade
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- Crialesi-Esposito, Marco (author)
- KTH,Linné Flow Center, FLOW,Strömningsmekanik och Teknisk Akustik,INFN, Sez Torino, Via Pietro Giuria 1, I-10125 Turin, Italy.
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- Chibbaro, Sergio (author)
- Univ Paris Saclay, CNRS, LISN, F-91400 Orsay, France.;Univ Paris Saclay, SPEC, CEA, CNRS,UMR 3680,CEA Saclay, Gif Sur Yvette, France.
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- Brandt, Luca (author)
- KTH,Linné Flow Center, FLOW,Strömningsmekanik och Teknisk Akustik,Norwegian Univ Sci & Technol NTNU, Dept Energy & Proc Engn, Trondheim, Norway.
- (creator_code:org_t)
- 2023-01-06
- 2023
- English.
- In: Communications Physics. - : Springer Nature. - 2399-3650. ; 6:1
- Journal article (peer-reviewed)
Abstract
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- The dynamics of droplet fragmentation in turbulence is described by the Kolmogorov-Hinze framework. Yet, a quantitative theory is lacking at higher concentrations when strong interactions between the phases and coalescence become relevant, which is common in most flows. Here, we address this issue through a fully-coupled numerical study of the droplet dynamics in a turbulent flow at R-lambda & AP; 140, the highest attained up to now. By means of time-space spectral statistics, not currently accessible to experiments, we demonstrate that the characteristic scale of the process, the Hinze scale, can be precisely identified as the scale at which the net energy exchange due to capillarity is zero. Droplets larger than this scale preferentially break up absorbing energy from the flow; smaller droplets, instead, undergo rapid oscillations and tend to coalesce releasing energy to the flow. Further, we link the droplet-size distribution with the probability distribution of the turbulent dissipation. This shows that key in the fragmentation process is the local flux of energy which dominates the process at large scales, vindicating its locality.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Strömningsmekanik och akustik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Fluid Mechanics and Acoustics (hsv//eng)
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