Shear-induced self-diffusion in a wall-bounded dilute suspension.
Random migrations of non-Brownian neutrally buoyant particles in the flow of a dilute suspension in a periodic Couette cell is simulated on the basis of a dipole model. A diffusivity is due to far-field collective hydrodynamic interactions. Large-scale fluctuations of particle concentration induce fluid velocity disturbances with a length scale comparable to the cell size. The calculated self-diffusivity coefficient is linear in particle volume content and agrees well with the experimental data.
Asmolov
Evgeny S
ES
Central Aero-Hydrodynamic Institute, Zhukovsky, Moscow Region, 140180, Russia. aes@an.aerocentr.msk.su