A “test of concept” comparison of aerodynamic and mechanical resuspension mechanisms for particles deposited on field rye grass ( Secale cercele). Part 1. Relative particle flux rates
Resuspension of uniform latex micro spheres deposited on a single seed pod of field rye grass stalk and head was investigated experimentally in a wind tunnel. The experiment was designed to distinguish aerodynamic (viscous and turbulent) mechanisms from mechanical resuspension resulting from the osc...
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Veröffentlicht in: | Atmospheric environment (1994) 2004-09, Vol.38 (28), p.4789-4797 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Resuspension of uniform latex micro spheres deposited on a single seed pod of field rye grass stalk and head was investigated experimentally in a wind tunnel. The experiment was designed to distinguish aerodynamic (viscous and turbulent) mechanisms from mechanical resuspension resulting from the oscillatory impact of the grass hitting a stationary object. The experiment was run for deposited spherical latex particles with diameters from 2 to 10
μm. Wind tunnel tests were run for wind speeds from 2 to 18.5
m
s
−1 and a turbulence intensity (root-mean-square fluctuation wind speed/mean wind speed) of 0.1. Our experiments showed the following for our test of concept experiment:
•
Resuspension particle flux increases when mechanical impacts occur.
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Mechanical resuspension dominated for 2 μm particles over purely aerodynamic resuspension, but for larger particles aerodynamic mechanisms were roughly equally effective in resuspending particles. |
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ISSN: | 1352-2310 1873-2844 |
DOI: | 10.1016/j.atmosenv.2004.03.070 |