Where do small, weakly inertial particles go in a turbulent flow?

Abstract

We report experimental results on the dynamics of heavy particles of the size of the Kolmogorov-scale in a fully developed turbulent flow. The mixed Eulerian structure function of two-particle velocity and acceleration difference vectors <δv\cdotδa_p> was observed to increase significantly with particle inertia for identical flow conditions. We show that this increase is related to a preferential alignment between these dynamical quantities. With increasing particle density the probability for those two vectors to be collinear was observed to grow. We show that these results are consistent with the preferential sampling of strain-dominated regions by inertial particles.

8 pages, 4 figures, accepted for publication JFM (fast-track)

References in corpus (4)

• Finite-size effects in the dynamics of neutrally buoyant particles in turbulent flow
• Tetrahedron deformation and alignment of perceived vorticity and strain in a turbulent flow
• Experimental measurement of acceleration correlations and pressure structure functions in high Reynolds number turbulence
• Inertial effects on two-particle relative dispersion in turbulent flows

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