Convective diffusion from strip-like micro-probes into colloidal suspensions |
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Authors: | Ond?ej Wein |
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Affiliation: | Institute of Chemical Process Fundamentals, ASCR, v.v.i., Praha 6, Czech Republic |
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Abstract: | Full equations of convective diffusion are solved numerically for a strip-like (2D) electrodiffusion friction probe in a stream of microdisperse liquid, assuming a non-linear near-to-wall velocity profile ranging from simple shear flow (p = 1) to ideal slip (p = 0). The range of generalized Peclet number H from H = 0.01 (almost pure spatial diffusion) to H = 100 (diffusion layer with negligible longitudinal diffusion) covers all cases of possible experimental relevance. The main result is expressed as a relative deviation of actual total diffusion flux N from its diffusion-layer approximation NDLA, Ψ = N/NDLA ? 1. |
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