10-. mu. m two-stage inlet for sampling indoor aerosols
An inlet for sampling indoor aerosols has been developed. It has a cutpoint of 10 +/- 0.5 ..mu..m aerodynamic diameter and a penetration curve slope of 1.51. The unit is designed to operate at a flow rate of 240 L/min. Tests in a wind tunnel at speeds of 1, 2 and 4 km/h showed there to be no substantial variation of cutpoint with wind speed. In tests with 9.7 ..mu..m particles at wind speed of 2 km/h, the sampler orientation was varied to simulate air stream angles of attack. For the sampler axis at -10/sup 0/, 0/sup 0/ and +10/sup 0/ from the vertical direction, the range of penetration values was only from 51.2 and 53.9%. Other tests, in which the flow rate was varied from 216 to 264 L/min, showed the performance of the inlet was not appreciably affected. Re-entrainment or bounce of solid particles is not of consequence. The difference in penetration of 20-..mu..m aerodynamic diameter glass beads and liquid aerosol is less than 2% at 2 km/h. Collection filters were examined for uniformity of deposits associated with the sampling of 10.2-..mu..m particles. The pooled standard deviation of three test filters with 10 subsamples from each test filter was only 1.8% of the mean of the deposits.
- Research Organization:
- Texas A and M Univ., College Station
- OSTI ID:
- 5885032
- Journal Information:
- J. Air Pollut. Control Assoc.; (United States), Journal Name: J. Air Pollut. Control Assoc.; (United States) Vol. 35:10; ISSN JPCAA
- Country of Publication:
- United States
- Language:
- English
Similar Records
A constant flow filter air sampler for workplace environments
A CAM (continuous air monitor) sampler for collecting and assessing alpha-emitting aerosol particles
Related Subjects
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
AIR POLLUTION
AIR POLLUTION MONITORING
COLLOIDS
DESIGN
DISPERSIONS
EQUIPMENT
INDOOR AIR POLLUTION
PARTICLES
PARTICULATES
PERFORMANCE TESTING
POLLUTION
SAMPLERS
SAMPLING
SOLS
TESTING