Abstract
The rotational motion of spherical particles suspended in a turbulent flow field may not necessarily adapt to the fluid rotation, i.e., the particle spin may be different from the fluid vorticity. The translational and rotational motions of tiny particles are described in a Lagrangian framework using the point-particle approximation. The turbulence of the fluid phase is obtained by means of direct numerical simulations in which the feed-back from the particles onto the flow field is accounted for by a two-way coupling scheme. Particles with three different response times are considered, each for which millions of particles are released randomly in a turbulent channel flow at a frictional Reynolds number 360. The lightest particles with rotational response time 0.3 times the viscous time scale exhibited preferential concentration in areas with low streamwise vorticity but rotated passively along with the local fluid. The heaviest particles with a 30 times longer response time spun strikingly different from the particle spin observed in a one-way coupled simulation. This phenomenon can be ascribed primarily to the substantial modulation of the carrier-phase turbulence caused by the feed-back from the particles in the two-way coupled approach. Due to their higher rotational inertia, these particles did not even adjust to the rotational motion of the local fluid.
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