Abstract
To optimize UV disinfection of microbes between concentric cylinders, inactivation in the plug flow reactor geometries of laminar Poiseuille flow, turbulent flow, and laminar Taylor−Couette flow is investigated experimentally and numerically. It is found that there is an optimum ratio of radiation penetration depth to gap width λ/d for each of the three flow patterns. The optimum λ/d for laminar Poiseuille flow, turbulent flow, and laminar Taylor−Couette flow are 1.5, 1, and 0.5, respectively. It is also concluded that laminar Poiseuille flow provides inferior (small) inactivation levels while laminar Taylor−Couette flow provides superior (large) inactivation levels. The relative inactivation levels are as follows: laminar Poiseuille flow < turbulent flow < laminar Taylor−Couette flow.
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