Hydrodynamic friction coefficients of coated spherical particles

The complete set of hydrodynamic friction coefficients for a spherical particle coated with a porous layer and immersed in a viscous fluid is evaluated in analytic form. The coefficients allow the calculation of the flow disturbance caused by the coated particle for any incident flow which satisfies the creeping flow equations. The coefficients may be used for the evaluation of hydrodynamic pair interactions between coated spheres, as well as for the numerical calculation of many-sphere hydrodynamic interactions, and the calculation of transport properties of suspensions of coated spherical particles. (C) 2009 American Institute of Physics. [DOI: 10.1063/1.3125382]