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Journal of Korean Society of Water and Wastewater Vol 26, No4, pp521-533, August, 2012 ,  26, 4 pp521-533, 8, 2012 1.                  .    (UV; Ultra Violet)         ,           . UV           ,         ,     . ,   pH     ,       .  UV     ,    10NTU     .               CFD  Axial Reactor Type      UV Dose UV Dose Predictions for Ultra Violet Flowing Water Purification of Axial Reactor Type based on the location of the exit by CFD  * ···· Jong-Woong Choi * ·Seong-Su Kim·No-Suk Park·Young-Joo Lee·Seon-Ha Chae K-water () (2012 57 ; 2012 810 ; 2012 813 ) Interest in application of ultraviolet light technology for primary disinfection that used for the treatment of water for consumption and wastewater has increased significantly in recent years. Analysis of these systems has been carried out using Computational Fluid Dynamics (CFD) procedure. It offers advantages over other techniques in specific circumstances. CFD has emerged as a powerful tool to aid design of a UV reactor by providing the UV dose delivered by the proposed reactor design and allowing engi-neers to evaluate alternative designs in much less time and at a reasonable cost. In this study, five different configurations of the apparatus depending on the location of the exit are evaluated in terms of maximum dose, minimum dose, flow patterns, particle tracks and transient dose. The configuration 3 results have higher minimum UV dose value and uniform particle distribution of the UV dose on the outlet than other‘s.Key words : ultra violet(UV), UV reactor, UV dose, CFD, radiation: , UV , UV , *Corresponding author : Tel.: +82-42-870-7541, E-mail : woong@kwater.or.kr(J. W. Choi)