2018/11/29 by Prasad Perlekar
Materials Science · Physics and Astronomy · #Block Copolymer Self-Assembly #Dissipation #Energy flux #Flux (metallurgy) #Kinetic energy #Pickering emulsions and particle stabilization #Probability density function #Reynolds number #Solidification and crystal growth phenomena #Turbulence #Turbulence kinetic energy #Vorticity #cond-mat.soft #physics.flu-dyn
paper · pdf · doi:10.1017/jfm.2019.425
arxiv created 2018/11/29 · openalex created_date 2018/12/11 · openalex publication_date 2019/06/24 · arxiv updated 2019/07/24 · openalex updated_date 2026/08/05
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.