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Systems of spherical particles moving in Stokes flow are studied for adifferent particle internal structure and boundaries, including the Navier-slipmodel. It is shown that their hydrodynamic interactions are well described bytreating them as solid spheres of smaller hydrodynamic radii, which can bedetermined from measured single-particle diffusion or intrinsic viscositycoefficients. Effective dynamics of suspensions made of such particles is quiteaccurately described by mobility coefficients of the solid particles with thehydrodynamic radii, averaged with the unchanged direct interactions between theparticles.

Hydrodynamic radius approximation for spherical particles suspended in a viscous fluid: influence of particle internal structure and boundary