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System for characterizing aerosols from bubbling liquids.

Wangwongwatana-S; Scarpino-PV; Willeke-K; Baron-PA
Aerosol Sci Tech 1990; 13(3):297-307
An experimental system was developed which could be used to investigate the transfer of materials from the liquid phase to the gaseous phase by multiple bubble bursting at the surface of the bubbling liquid. A number of operational parameters, such as bubble size, superficial gas velocity, bubble rise distance, and the compositions of the liquid could be changed. Uniform bubbles of several sizes were obtained with capillary tube gas diffusers. The system provided real time information on concentrations and size distributions of the liquid droplets and of the materials remaining from droplets of various size ranges after their evaporation. The fraction of the generated droplets which contains the study material could be determined. The system was used to characterize the bubble induced aerosols from a simulated activated sludge aeration tank and examples of the results were presented. With modifications, the system could be used to simulate other processes involving gas bubbling in a liquid, such as fermenters, health club whirlpools, and wastewater aeration tanks. The liquid in these systems may contain dissolved solids which affect the surface tension of the liquid suspension. This also caused changes in the bubble size and shape, the particle collection efficiency of the bubbles, and droplet formation from the bubble film and therefore the size of the residual particles in the final aerosol.
NIOSH-Author; Aerosols; Airborne-particles; Air-quality-monitoring; Air-sampling; Aerosol-sampling; Aerosol-particles; Physical-properties
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Journal Article
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Aerosol Science and Technology