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Water treatment processes using ultraviolet (UV) technology have seen a rapid growth. UV Photolysis and photo-initiated oxidation have great potentials for the inactivation of microorganisms and the destruction of a wide range of contaminants in water. UV reactor simulation can be achieved by considering the rate of reaction linked to the non-homogenous UV-radiation power through the local volumetric rate of energy absorption. The performance of UV reactors used for water treatment is greatly influenced by the reactor hydrodynamics due to the nonhomogeneity of the radiation field. Reliable modeling of the reactor flow structures is therefore crucial for the design process. In the study of F. Taghipour et al. the turbulent flow through two characteristic annular UV-reactor configurations was investigated through computational fluid dynamics. The modeling results were evaluated with the velocity profiles from particle image velocimetry experiments. The validated CFD hydrodynamic models could be integrated with kinetic and radiation distribution models for UV-reactor performance simulation.
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