Suspensions of Colloidal Particles and Aggregates by Frank Babick

Author:Frank Babick
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

Finally, it should be mentioned that gas-borne aggregates require different or modified models for their dynamic properties than those suspended in liquids, to which the concepts of continuum mechanics apply. The drag on colloidal aerosol particles is not just a result from viscous friction, but is considerably affected by impacts of the gas molecules on the particle surface. This is because gas molecules interact via elastic collisions with mean free paths much larger than molecule size (approx. 66 nm at atmospheric pressure), whereas the interaction of liquid molecules occurs over distances in the Ångström range. This difference can be regarded by appropriate correction functions (e.g. Cunningham 1910) or may require completely different solutions (Epstein 1924). Since aerosol aggregates are beyond the scope of this book, the readers are referred to the literature (Dahneke 1982; Wang and Sorensen 1999; Filippov 2000; Lall and Friedlander 2006).

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