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| - Ultraviolet Disinfection: Similitudein Taylor−Couette and ChannelFlow
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| Abstract
| - The inactivation data for Escherichia coli are recorded forthe three reactor geometries of Taylor−Couette flowand flow between either concentric cylinders or a squarechannel. All of the data are shown to be correlated withthe assumption of plug flow. In particular, the effectsof nonuniform radiation levels are accounted for by integrationacross the fluid channel as done previously. However, anew correction factor is introduced that is shown tobe inversely proportional to the laminar, velocity boundarythickness to account for the effects of a concentrationboundary layer of surviving pathogen. It has also beendemonstrated that the common problems of nonuniformradiation levels and concentration boundary layer effectsin UV reactors are largely eliminated with the use of Taylor−Couette flow. Moreover, the repetitive exposure of fluid parcelsto a small number of lamps in the rotating Taylor−Couette flow decreases maintainance requirementscompared to the hydrodynamic equivalent of cross-flowover a tube bank or lamp array. Over a 3-log reduction inthe inactivation of E. coli was demonstrated comparedto a conventional channel with the same radiation dosage.Moreover, greater than a 2-log reduction was evidentcompared to flow through concentric cylinders.
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