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Flow structures govern particle collisions in turbulence

Jason R. Picardo, Lokahith Agasthya, Rama Govindarajan, and Samriddhi Sankar Ray
Phys. Rev. Fluids 4, 032601(R) – Published 21 March 2019

Abstract

The role of the spatial structure of a turbulent flow in enhancing particle collision rates in suspensions is an open question. We show and quantify, as a function of particle inertia, the correlation between the multiscale structures of turbulence and particle collisions: Straining zones contribute predominantly to rapid head-on collisions compared to vortical regions. We also discover the importance of vortex-strain worm-rolls, which goes beyond ideas of preferential concentration and may explain the rapid growth of aggregates in natural processes, such as the initiation of rain in warm clouds.

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  • Received 24 October 2018

DOI:https://doi.org/10.1103/PhysRevFluids.4.032601

©2019 American Physical Society

Physics Subject Headings (PhySH)

Fluid DynamicsNonlinear DynamicsInterdisciplinary Physics

Authors & Affiliations

Jason R. Picardo1,*, Lokahith Agasthya2,†, Rama Govindarajan1,‡, and Samriddhi Sankar Ray1,§

  • 1International Centre for Theoretical Sciences, Tata Institute of Fundamental Research, Bangalore 560089, India
  • 2Indian Institute for Science Education and Research, Pune 411008, India

  • *jrpicardo@icts.res.in; picardo21@gmail.com
  • lokahith.agasthya@students.iiserpune.ac.in
  • rama@icts.res.in
  • §samriddhisankarray@gmail.com

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Issue

Vol. 4, Iss. 3 — March 2019

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