Abstract
Levich's convective diffusion model for particle migration towards the surface of a rotating disk is extended to account for the particle size. The solution of the convective diffusion integral equation shows that the diffusional boundary layer thickness, δ c, is independent of the disk radius but is inversely dependent on the particle size. The surface flux is shown to be higher for larger particles than Levich's prediction, but the two models approach as the particles become smaller.
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