Experimental study of virtual impactors
Conference
·
OSTI ID:5640916
Virtual impactors are currently being used in a number of instruments to separate an aerosol into different size ranges. The virtual impactor is a variation of the standard impactor in which the impaction surface is replaced by an orifice into which particles can pass and be collected or counted. We have made an experimental study of the collection characteristics of virtual impactors. The parameters varied included: acceleration nozzle-to-collection probe distance, the ratio of the collection probe-to-acceleration nozzle diameters, and the ratio of collection probe-to-inlet flows. Measurements were also made with different collection probe geometries. It was found that it is possible to parameterize much of the data by introduction of the Stokes number and an effective minor flow collection efficiency. One disadvantage of the virtual impactor is that in the transition region particles are collected on the inside walls of the collection probe near the probe tip. The amount that is collected is a sensitive function of the probe geometry.
- Research Organization:
- Argonne National Lab., IL (USA); Rensselaer Polytechnic Inst., Troy, NY (USA)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5640916
- Report Number(s):
- CONF-791018-2
- Country of Publication:
- United States
- Language:
- English
Similar Records
High efficiency virtual impactor
High efficiency virtual impactor
High efficiency virtual impactor
Patent
·
Wed Mar 26 23:00:00 EST 1980
·
OSTI ID:6692950
High efficiency virtual impactor
Patent
·
Mon Nov 16 23:00:00 EST 1981
·
OSTI ID:5684836
High efficiency virtual impactor
Patent
·
Wed Dec 31 23:00:00 EST 1980
·
OSTI ID:864046