LEEWARD DEPOSITION OF PARTICLES ON CYLINDERS FROM MOVING AEROSOLS
Abstract
A study of leeward (back) deposition of moving aerosols on cylinders was conducted in a wind tunnel. Cylinder sizes were varied from 3.1 to 41 mm in diameter, aerosol particles from 4.5 microns to 110 microns in diameter, and wind velocities from 3 to 18 mph. There was little leeward deposition of particles over 100 microns in diameter, an intermediate amount of deposition of particles between 10 microns and 100 microns in diameter (depending on conditions), and a large deposition of particles below 10 microns in diameter at velocities from 3 to 18 mph. The ratio of leeward and windward particle count deposits on the cylinders were calculated from experimental results. The impaction parameter K and the Reynolds number of the airflow around the cylinder were also calculated. When K was greater than the critical value of 0.0625, the ratio was 0.4% or less, and showed no variation with particle size, cylinder diameter, and wind velocity. When K was less than 0.0625, the ratio ranged from about 0.5% to 131%. In general, the ratio increased with decreasing particle size and wind velocity and with increasing cylinder diameter.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1965
- Accession Number
- AD0622370
Entities
People
- Gabrielle Asset
- Thomas G. Hutchins
Organizations
- Edgewood Chemical Biological Center