Evaluation of the Performance of a Charged Droplet Scrubber (Aerosol, Collection)
Wang, Hwa-Chi
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https://hdl.handle.net/2142/69941
Description
Title
Evaluation of the Performance of a Charged Droplet Scrubber (Aerosol, Collection)
Author(s)
Wang, Hwa-Chi
Issue Date
1984
Department of Study
Civil Engineering
Discipline
Environmental Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Sanitary and Municipal
Abstract
The performance of a charged droplet scrubber was examined in terms of the collision efficiency and the adhesion efficiency. Two models, the fixed collector model and the accelerating collector model, were proposed to predicted the collision efficiency. The former finds its application in low-energy scrubbers where the collectors usually fall at terminal velocity in the collection chamber, whereas the latter can be used to calculate the collision effeciency as a function of the travel distance of the accelerating collectors that are employed in high-energy scrubbers. Two corresponding well-controlled experiments were designed and performed to verify the proposed models. It was found that non-Stokesian correction, whenever applicable, must be incorporated in the theoretical models to obtain accurate predictions. Also, the problems associated with the limited improvement of charge-enhanced venturi scrubbers as encountered in real practices were analyzed using the proposed models and the causes were identified. In addition, the guidelines for the design and operation of a charged droplet scrubber under high velocity conditions were discussed. A simple adhesion model, based on the most convincing adhesion criterion available in the literature, was derived to calculate the adhesion efficiency as a function of the lumped parameter (CEH) which is determined by the characteristics of the scrubber employed and the particles to be controlled. This model, although highly simplified, can be used to identify when particle rebound from the droplet surface must be taken into account. Finally, the performance models for conventional scrubbers were borrowed to predict the overall efficiency of a charged droplet scrubber.
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