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Kinetic energy spectra and flux in turbulent phase-separating symmetric binary-fluid mixtures

Published online by Cambridge University Press:  24 June 2019

Prasad Perlekar Open the ORCID record for Prasad Perlekar [Opens in a new window]
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Abstract

We conduct direct numerical simulations (DNS) of the Cahn–Hilliard–Navier–Stokes (CHNS) equations to investigate the statistical properties of a turbulent phase-separating symmetric binary-fluid mixture. Turbulence causes an arrest of the phase separation which leads to the formation of a statistically steady emulsion. We characterise turbulent velocity fluctuations in an emulsion for different values of the Reynolds number and the Weber number. Our scale-by-scale kinetic energy budget analysis shows that the interfacial terms in the CHNS equations provide an alternative route for the kinetic energy transfer. By studying the probability distribution function (p.d.f.) of the energy dissipation rate, the vorticity magnitude and the joint-p.d.f. of the velocity-gradient invariants we show that the statistics of the turbulent fluctuations do not change with the Weber number.

JFM classification

Drops and Bubbles: Breakup/coalescence Turbulent Flows: Isotropic turbulence Turbulent Flows: Turbulence simulation
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 873 , 25 August 2019 , pp. 459 - 474
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Copyright
© 2019 Cambridge University Press 

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