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
Hauptverfasser: Gillette, Dale A., Lawson, Robert E., Thompson, Roger S.
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. • Mechanical resuspension dominated for 2 μm particles over purely aerodynamic resuspension, but for larger particles aerodynamic mechanisms were roughly equally effective in resuspending particles.
ISSN:1352-2310
1873-2844
DOI:10.1016/j.atmosenv.2004.03.070