A virtual impactor aerosol concentrator with a circumferential inlet slot has been
built and tested. Circumferential slot virtual impactors (CSVIs) have low pressure
losses, similar to linear slot impactors, but without particle losses due to end effects.
The CSVI was designed using the results from a computational fluid dynamics
study. The device has a total sampling flow rate of 10 to 30 L/min and a concentration
factor of 10:1. CSVIs were built based on the CFD study design and tested with oleic
acid droplets and polystyrene latex beads. The test results found a cutpoint Stokes
number of 0.75 and 90% particle transmission at least 52X the Stokes cutpoint. At a
flow rate of 10 L/min the cutpoint is 2.0 µm aerodynamic diameter (AD) and >90%
transmission efficiency was found between 4 mm AD, and 22 µm AD. At the flow rate
of 30 L/min the cutpoint is 1.2 mm AD and a >90% transmission efficiency was found
between 2 and 10 mm AD. Performance and pressure drop curves were found for a
variety of flow rates. The pressure drop across the CSVI at 10 L/min was 270 Pa (1.1 in
H2O) with an ideal power consumption of 0.045 watts. At 30 L/min the pressure drop
was 970 Pa (3.9 in H2O) with an ideal power consumption of 0.44 watts.
| Identifer | oai:union.ndltd.org:tamu.edu/oai:repository.tamu.edu:1969.1/ETD-TAMU-1143 |
| Date | 15 May 2009 |
| Creators | Adams, Clinton Wayne |
| Contributors | McFarland, Andrew |
| Source Sets | Texas A and M University |
| Language | en_US |
| Detected Language | English |
| Type | Book, Thesis, Electronic Thesis, text |
| Format | electronic, application/pdf, born digital |
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