Aerosol sedimentation in a spinning spiral duct centrifuge
Studies to gain information regarding the performance of the spiral duct centrifuge when sampling atmospheric aerosols are described. The instrument is calibrated experimentally with a dilute laboratory aerosol composed of unit density spheres, and under calibration conditions the gas phase of the aerosol and the winnowing medium are both dry air. Aerosols of environmental concern may differ from the laboratory aerosol in two main respects; the carrying medium in which particles are suspended may be other than dry air and the particulate mass concentration may be large. The possibility that the performance of the spiral duct centrifuge could be influenced by the properties of the gas phase and particulate concentration of the aerosol being sampled has not been evaluated. The specific objective was to investigate the influence of these properties upon the settling behavior and subsequent aerodynamic classification of an aerosol particle in the spiral duct centrifuge. It is demonstrated experimentally that the gas phase and particulate mass concentration of an aerosol can indeed produce effects which may severely reduce the particle size separating capability of the spiral duct centrifuge. Laboratory procedures have been established that permit accurate particle size assessment when such aerosols are sampled. In addition, mathematical modelling of the instrument has allowed operating conditions suitable for the size classification of a general aerosol to be predicted.
- Research Organization:
- Rochester Univ., NY (USA)
- OSTI ID:
- 7260306
- Report Number(s):
- UR-3055-21
- Country of Publication:
- United States
- Language:
- English
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420200* -- Engineering-- Facilities
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& Techniques
440300 -- Miscellaneous Instruments-- (-1989)
47 OTHER INSTRUMENTATION
AERODYNAMICS
AEROSOLS
CALIBRATION
CENTRIFUGES
COLLOIDS
CONCENTRATORS
DISPERSIONS
EQUIPMENT
FLUID MECHANICS
MEASURING INSTRUMENTS
MECHANICS
PARTICLE SIZE
PARTICLE SIZE CLASSIFIERS
PERFORMANCE
SIZE
SOLS