title: Angular Dynamics of a Small Particle in Turbulence.
abstract: We compute the angular dynamics of a neutrally buoyant nearly spherical particle immersed in an unsteady fluid. We assume that the particle is small, that its translational slip velocity is negligible, and that unsteady and convective inertia are small perturbations. We derive an approximation for the torque on the particle that determines the first inertial corrections to Jeffery's equation. These corrections arise as a consequence of local vortex stretching and can be substantial in turbulence, where local vortex stretching is strong and closely linked to the irreversibility of turbulence.
authors.affiliation: Aix-Marseille University-IUSTI (UMR CNRS 7343), 13 453 Marseille Cedex, France.
authors.forename: F
authors.initials: F
authors.lastname: Candelier
authors.affiliation: Department of Physics, Gothenburg University, SE-41296 Gothenburg, Sweden.
authors.forename: J
authors.initials: J
authors.lastname: Einarsson
authors.affiliation: Department of Physics, Gothenburg University, SE-41296 Gothenburg, Sweden.
authors.forename: B
authors.initials: B
authors.lastname: Mehlig