Development of an aerosol size classifier: a two-dimensional self-similar virtual impactor. Progress report, January 31, 1978--January 31, 1979
The purpose of this research was to characterize the performance of a rectangular slit self-similar virtual impactor. A mathematical description of two-dimensional jets of ideal fluid impinging upon a void was developed with conformal mapping techniques. The analysis was extended to include converging throat geometries and variable secondary flows into the void space. Particle trajectories were simulated for a number of theoretically admissible instrument geometries. Visual observations of two-dimensional self-similar jets impinging upon a void were conducted with a scaled-up water model. It was found that the limiting void width h/sub lim/w marking the onset of fluid instabilities increased for an ntermediate value of the fluid deflecting plate angle ..beta.. for useful values of throat angle ..beta../sub 0/ and that h/sub lim/w increased with larger secondary flows into the void. Experiments were performed with 2.5 ..mu..m DOP droplets over a wide range of prototype geometries to measure the magnitude of internal losses and to fully characterize the instrument response.
- Research Organization:
- Illinois Univ., Urbana (USA). Dept. of Civil Engineering; Illinois Univ., Urbana (USA). Dept. of Physics
- OSTI ID:
- 6280141
- Report Number(s):
- COO-4319-4
- Country of Publication:
- United States
- Language:
- English
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Aerosol sizing with a slotted virtual impactor
Development of an aerosol size classifier. Progress report, May 31, 1977--January 31, 1978
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420200* -- Engineering-- Facilities
Equipment
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424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
AEROSOLS
AIR POLLUTION
CLASSIFICATION
COLLOIDS
DATA
DATA FORMS
DISPERSIONS
EQUIPMENT
EXPERIMENTAL DATA
GRAPHS
INFORMATION
MATHEMATICAL MODELS
MOCKUP
NUMERICAL DATA
PARTICLE SIZE CLASSIFIERS
PERFORMANCE
PERFORMANCE TESTING
POLLUTION
RESEARCH PROGRAMS
SOLS
STRUCTURAL MODELS
TESTING
THEORETICAL DATA