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Shape-dependence of particle rotation in isotropic turbulence

Journal article
Authors M. Byron
Jonas Einarsson
Kristian Gustavsson
G. Voth
Bernhard Mehlig
E. Variano
Published in Physics of Fluids
Volume 27
Issue 3
Pages Article nr. 4913501
ISSN 1070-6631
Publication year 2015
Published at Department of Physics (GU)
Pages Article nr. 4913501
Language en
Links dx.doi.org/10.1063/1.4913501
Keywords SIMPLE SHEAR-FLOW, ELLIPSOIDAL PARTICLES, ALIGNMENT, DYNAMICS, MOTION, FLUID, ORIENTATION, VORTICITY, GRADIENT, OCEAN, Mechanics, Physics, Fluids & Plasmas
Subject categories Physical Sciences

Abstract

We consider the rotation of neutrally buoyant axisymmetric particles suspended in isotropic turbulence. Using laboratory experiments as well as numerical and analytical calculations, we explore how particle rotation depends upon particle shape. We find that shape strongly affects orientational trajectories, but that it has negligible effect on the variance of the particle angular velocity. Previous work has shown that shape significantly affects the variance of the tumbling rate of axisymmetric particles. It follows that shape affects the spinning rate in away that is, on average, complementary to the shape-dependence of the tumbling rate. We confirm this relationship using direct numerical simulations, showing how tumbling rate and spinning rate variances show complementary trends for rod-shaped and disk-shaped particles. We also consider a random but non-turbulent flow. This allows us to explore which of the features observed for rotation in turbulent flow are due to the effects of particle alignment in vortex tubes. (C) 2015 AIP Publishing LLC.

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