Can the Acoustical Particle Sizing Device be Used for Fog Droplet Counting and Sizing?
Public Deposited- Last Modified
- February 28, 2019
- Creator
-
Singh, Devendra Pal
- Affiliation: Gillings School of Global Public Health, Department of Environmental Sciences and Engineering
- Abstract
- The acoustical particle sizing device was evaluated for counting and sizing of fog droplets. Fog droplets were generated under controlled conditions in the laboratory, and measurements for the fog droplet counts were made at different flow rates (5.7 to 14.2 liters/minute). Most of the droplets were found to be in the size range of 5-30 μm. The Reynolds number was calculated by reference to the flow rates. Fog droplet sizes were measured with optical and electron microscopes and correlated with a standard curve of particle threshold diameter versus critical flow Reynolds number. The mean diameters estimated by using the standard curve were in agreement with the microscope values of mean droplet diameter. A Rich 100 Condensation Nuclei monitor was also operated simultaneously during the droplet counting by the acoustical particle sizing device, to monitor condensation nuclei counts in the laboratory. The results indicated that the condensation nuclei number in the laboratory correlate with the fog droplet threshold diameters. Aerosols of a uniform size (35 microns) were generated by the vibrating orifice monodisperse aerosol generator and counted at three different flow rates by the acoustical particle sizing device. The counts/liter/minute were similar, indicating the reliability of the acoustical particle sizing device. Key Words: Acoustical particle sizing device, condensation nuclei, fog droplets, particle size distribution.
- Date of publication
- December 1988
- DOI
- Resource type
- Rights statement
- In Copyright
- Advisor
- Saxena, Vinod K.
- Fraser, David A.
- Reist, Parker C.
- Degree
- Master of Science in Environmental Engineering
- Academic concentration
- Industrial Hygiene
- Degree granting institution
- University of North Carolina at Chapel Hill
- Graduation year
- 1988
- Language
- Deposit record
- ad7e9272-7c4f-43e0-afeb-7a5f2526ad76
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