Efficiency of inertial deposition of aerosol particles in fibrous filters with regard to particle rebounds from fibers |
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Authors: | A L Chernyakov A A Kirsh V A Kirsh |
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Institution: | 1.National Research Center “Kurchatov Institute”,Moscow,Russia;2.Frumkin Institute of Physical Chemistry and Electrochemistry,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | The inertial deposition of submicron aerosol nanoparticles onto fibers during gas filtration through fine-fiber filters is
considered. It is shown that there is critical filtration velocity U* below which the energy loss upon collisions has no influence on the filtration efficiency. Above this critical velocity,
the filtration efficiency depends on the mechanism of the inelastic energy loss and can be noticeably lower than the result
of its estimation with no allowance for the particle rebound. For a rather dense fibrous medium, when not all particles that
have rebounded from a fiber have time to attain the flow velocity before the next collision with another fiber, the filtration
efficiency depends on the velocity distribution of the rebounding particles. It is shown that, in this case, the filtration
efficiency must increase with the packing density of a filter. |
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