Effects of sampling nozzles on the particle-collection characteristics of inertial sizing devices. Final report
In several particle-sizing samplers, the sample extraction nozzle is necessarily closely coupled to the first inertial sizing stage. Devices of this type include small sampling cyclones, right-angle impactor precollectors for in-stack impactors, and the first impaction stage of several cascade impactors. In a recent laboratory study of a stack-sampling cyclone with various sampling nozzles, significant perturbations were observed in the actual D50 when some of the nozzles were used. Some nozzles caused the D50 of the cyclone to be reduced from 10 micrometers to less than 6 micrometers. Several alternate nozzle designs were considered to alleviate this behavior. Simple extension of the nozzle length was sufficient to restore the 10-micrometers sampler D50, but at the expense of enhanced deposition of the test-aerosol particles on the nozzle walls.
- Research Organization:
- Southern Research Inst., Birmingham, AL (USA)
- OSTI ID:
- 6419412
- Report Number(s):
- PB-87-191508/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AEROSOLS
AIR SAMPLERS
COLLOIDS
CONCENTRATORS
CYCLONE SEPARATORS
DISPERSIONS
EQUIPMENT
INERTIAL SEPARATORS
NOZZLES
PARTICLE SIZE
PARTICLES
PARTICULATES
POLLUTION CONTROL EQUIPMENT
SAMPLERS
SEPARATION EQUIPMENT
SIZE
SOLS