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

Abstract

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.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Laboratory Directed Research and Development (LDRD) Program
OSTI Identifier:
1394971
Report Number(s):
LA-UR-16-27013
Journal ID: ISSN 0021-8502
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Aerosol Science
Additional Journal Information:
Journal Volume: 112; Journal Issue: C; Journal ID: ISSN 0021-8502
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Colloidal rod-shaped particles; Particle adhesion; Surface forces; Aerodynamic forces

Citation Formats

Brambilla, Sara, Speckart, Scott, and Brown, Michael J. Adhesion and aerodynamic forces for the resuspension of non-spherical particles in outdoor environments. United States: N. p., 2017. Web. doi:10.1016/j.jaerosci.2017.07.006.
Brambilla, Sara, Speckart, Scott, & Brown, Michael J. Adhesion and aerodynamic forces for the resuspension of non-spherical particles in outdoor environments. United States. doi:10.1016/j.jaerosci.2017.07.006.
Brambilla, Sara, Speckart, Scott, and Brown, Michael J. Wed . "Adhesion and aerodynamic forces for the resuspension of non-spherical particles in outdoor environments". United States. doi:10.1016/j.jaerosci.2017.07.006. https://www.osti.gov/servlets/purl/1394971.
@article{osti_1394971,
title = {Adhesion and aerodynamic forces for the resuspension of non-spherical particles in outdoor environments},
author = {Brambilla, Sara and Speckart, Scott and Brown, Michael J.},
abstractNote = {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.},
doi = {10.1016/j.jaerosci.2017.07.006},
journal = {Journal of Aerosol Science},
number = C,
volume = 112,
place = {United States},
year = {Wed Jul 26 00:00:00 EDT 2017},
month = {Wed Jul 26 00:00:00 EDT 2017}
}

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