Abstract
THE dependence of hydraulic and aerodynamic drag on particle shape has been of interest for a considerable time but theoretical work has greatly exceeded experimental results, especially for submicron particles. Fuchs1 gave a concise summary of the position and Preining2 and Vomela and Whitby3 have published mainly theoretical articles. Kunkel4 determined the drag on various configurations of steel balls glued together and falling in oil, and Megaw and Wiffen5 compared the diffusion coefficient of single and clustered submicron polystyrene spheres. Stober et al.6 deduced that the Stokes diameter dn of a cluster containing n spheres should be related to the diameter d1 of a single sphere by the expression and confirmed its validity in an experiment in which single particles and clusters of submicron polystyrene spheres were centrifuged out of a spinning air stream. Stober et al. also showed that, when expressed in terms of the Stokes diameter, Kunkel's results (in which the unit sphere was 0.12 cm diameter) agreed very well with those for submicron spheres in air.
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