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Title: Adhesion and aerodynamic forces for the resuspension of non-spherical particles in outdoor environments

Journal Article · · Journal of Aerosol Science

Particles deposited on an outdoor surface can be resuspended by wind gusts, become airborne, and be inhaled if small enough. If toxic or infectious, these particles may be dangerous for the populace health. It is therefore important to determine under which weather conditions a deposit of particle could be resuspended to implement the best response actions and plan clean-up. To this scope, one needs to consider the competing forces acting on the particle keeping it attached to the surface (gravity and adhesion) or trying to remove it (aerodynamic forces, i.e., lift and drag). Here, this article reviews the current understanding of the aforementioned forces for colloidal spherical particles and extends the existing theories to rod-shaped particles, representative for instance of Bacillus spores. In particular, for the adhesion force, the Derjaguin approximation was used and the adhesion force was computed from the radii of curvature of the particle and the surface at the point of closest approach. For the aerodynamic forces, we re-derived the equations for the drag and lift forces accounting for the shape of the particle. Both smooth and rough surfaces will be discussed, the former as idealized cases, the latter as more representative of real outdoor surfaces.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
AC52-06NA25396; 20140444ER
OSTI ID:
1394971
Alternate ID(s):
OSTI ID: 1549670
Report Number(s):
LA-UR-16-27013
Journal Information:
Journal of Aerosol Science, Vol. 112, Issue C; ISSN 0021-8502
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 37 works
Citation information provided by
Web of Science

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Cited By (5)

Overview of mechanistic particle resuspension models: comparison with compilation of experimental data journal August 2019
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Overview of mechanistic particle resuspension models: comparison with compilation of experimental data text January 2019
Adhesion of tungsten particles on rough tungsten surfaces using Atomic Force Microscopy journal November 2019
Particle resuspension from complex surfaces: current knowledge and limitations preprint January 2018