Skip to main content

Open Access Deposition and Suspension of Large, Airborne Particles

Download Article:
(PDF 498.8 kb)


The focus of this paper is the experimental determination of size-resolved estimates of both deposition and suspension velocities for large, airborne particles (greater than 10 μm diameter). Measurements of particle dry flux onto the top and bottom surface of a smooth, horizontal, surrogate surface were divided by measurements of the concentration of airborne particles to provide estimates of deposition and suspension velocities in 14 size intervals between 5 and 100 μm diameter. Eddy inertial deposition efficiencies (η di ) were determined as a function of eddy Stokes numbers (Stke) larger than 1 and the results agree with the model of Slinn and Slinn (1980). The model was used to provide estimates of both the inertial and gravitational components for total upward and downward particle velocities. Experimental results for individual particle size intervals produced highly variable results. Much of this variation can be attributed to experimental errors associated with the nature of the atmospheric experiments and not to problems with the model. Upward large particle suspension velocities are similar in magnitude to downward deposition velocities at higher wind speeds and represent a counteracting process to deposition processes that cannot be ignored for accurate representation of the long-range transport for particles between 5 and 50 μm diameter.

Document Type: Research Article


Affiliations: Department of Chemical and Environmental Engineering, Illinois Institute of Technology Chicago, Illinois, USA

Publication date: July 1, 2006

More about this publication?

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more