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UV reactor flow visualization and mixing quantification using three-dimensional laser-induced fluorescence

Gandhi, Varun, Roberts, Philip J.W., Stoesser, Thorsten, Wright, Harold and Kim, Jae-Hong 2011. UV reactor flow visualization and mixing quantification using three-dimensional laser-induced fluorescence. Water Research 45 (13) , pp. 3855-3862. 10.1016/j.watres.2011.04.041

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Abstract

Three-dimensional laser-induced fluorescence (3DLIF) was applied to visualize and quantitatively analyze mixing in a lab-scale UV reactor consisting of one lamp sleeve placed perpendicular to flow. The recirculation zone and the von Karman vortex shedding that commonly occur in flows around bluff bodies were successfully visualized. Multiple flow paths were analyzed by injecting the dye at various heights with respect to the lamp sleeve. A major difference in these pathways was the amount of dye that traveled close to the sleeve, i.e., a zone of higher residence time and higher UV exposure. Paths away from the center height had higher velocities and hence minimal influence by the presence of sleeve. Approach length was also characterized in order to increase the probability of microbes entering the region around the UV lamp. The 3DLIF technique developed in this study is expected to provide new insight on UV dose delivery useful for the design and optimization of UV reactors.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Uncontrolled Keywords: UV disinfection; Hydrodynamics; Unsteady turbulence; 3DLIF; Laser-induced fluorescence
Publisher: Elsevier
ISSN: 0043-1354
Last Modified: 08 May 2019 02:38
URI: http://orca.cf.ac.uk/id/eprint/43918

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