| Main Title |
Effects of Sampling Nozzles on the Particle Collection Characteristics of Inertial Sizing Devices. |
| Author |
Williamson, A. D. ;
Farthing, W. E. ;
Ward, T. E. ;
Midgett, M. R. ;
|
| CORP Author |
Southern Research Inst., Birmingham, AL.;Environmental Monitoring Systems Lab., Research Triangle Park, NC. |
| Year Published |
1987 |
| Report Number |
EPA-R-812274; EPA/600/D-87/167; |
| Stock Number |
PB87-191508 |
| Additional Subjects |
Particle size ;
Particulate sampling ;
Stationary sources
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB87-191508 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
19p |
| Abstract |
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 D(sub 50) when some of the nozzles were used. Some nozzles caused the D(sub 50) 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 D(sub 50), but at the expense of enhanced deposition of the test aerosol particles on the nozzle walls. |
| Supplementary Notes |
Sponsored by Environmental Monitoring Systems Lab., Research Triangle Park, NC. |
| NTIS Title Notes |
Final rept.. |
| PUB Date Free Form |
May 87 |
| Category Codes |
68A |
| NTIS Prices |
PC A02/MF A01 |
| Primary Description |
600/08 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
721923014 |
| Origin |
NTIS |
| Type |
CAT |
