Point-source dispersion of quasi-neutrally-buoyant inertial particles

Turbulence attenuation by large neutrally buoyant particles

Point - source inertial particle dispersion

The dispersion of inertial particles continuously emitted from a point source is analytically investigated in the limit of small inertia. Our focus is on the evolution equation of the particle joint probability density function p(x,v, t), x and v being the particle position and velocity, respectively. For finite inertia, position and velocity variables are coupled, with the result that p(x,v, t...

Inertial migration of neutrally buoyant particles in a square duct: An investigation of multiple equilibrium positions

Inertial migration of neutrally buoyant particles in a square duct has been investigated by numerical simulation in the range of Reynolds numbers from 100 to 1000. Particles migrate to one of a small number of equilibrium positions in the cross-sectional plane, located near a corner or at the center of an edge. In dilute suspensions, trains of particles are formed along the axis of the flow, ne...

Instabilities in the dynamics of neutrally buoyant particles

The asymptotic dynamics of finite-size particles is governed by a slow manifold that is globally attracting for sufficiently small Stokes numbers. For neutrally buoyant particles suspensions , the slow dynamics coincide with that of infinitesimally small particles, therefore the suspension dynamics should synchronize with Lagrangian particle motions. Paradoxically, recent studies observe a scat...

Acceleration statistics of neutrally buoyant spherical particles in intense turbulence.

We measure acceleration statistics of neutrally buoyant spherical particles with a diameter 0.4 < d/eta < 27 in intense turbulence (400 < R(lambda) < 815). High speed cameras image polystyrene tracer particles in a flow between counterrotating disks. The measurements of acceleration variance clearly resolve the transition from the tracer like behavior of small particles to the much small...