Interface topology and evolution of particle patterns on deformable drops in turbulence. (25th February 2022)

• Record Type: Journal Article
• Authors: Hajisharifi, Arash; Marchioli, Cristian; Soldati, Alfredo
• Is Part Of: Journal of fluid mechanics. Volume 933(2022)
• Publication Date: 2022-02-25
• Subjects: multiphase flow; Fluid mechanics -- Periodicals; 532.005
• DOI: 10.1017/jfm.2021.1094
• Languages: English
• ISSNs: 0022-1120

Abstract

Abstract: Abstract : The capture of neutrally buoyant, sub-Kolmogorov particles at the interface of deformable drops in turbulent flow and the subsequent evolution of particle surface distribution are investigated. Direct numerical simulation of turbulence, phase-field modelling of the drop interface dynamics and Lagrangian particle tracking are used. Particle distribution is obtained considering excluded-volume interactions, i.e. by enforcing particle collisions. Particles are initially dispersed in the carrier flow and are driven in time towards the surface of the drops by jet-like turbulent fluid motions. Once captured by the interfacial forces, particles disperse on the surface. Excluded-volume interactions bring particles into long-term trapping regions where the average surface velocity divergence sampled by the particles is zero. These regions correlate well with portions of the interface characterized by higher-than-mean curvature, indicating that modifications of the surface tension induced by the presence of very small particles will be stronger in the highly convex regions of the interface.