Abstract
This study proposes a secondary flow mixer for neutralizing reagent in a de-ballast pipe. Because the proposed mixer has a U-bent pipe configuration, it can be fabricated using commercially available pipe parts at low cost. Numerical simulations were conducted with four computational domains: one straight pipe (SP) and three U-bent pipes. The normalized coefficient of variation (CoV/CoV0) values of the U-bent pipe outlet for UP1, UP2 and UP3 were 0.096, 0.036 and 0.015 (90.4%, 96.4% and 98.5% degree of mixing, respectively). Instability was observed in the secondary flow motion because of the continuous curvature change of the U-bent pipe series and the density difference between mixing fluids. This instability enhances the mixing performance. Despite the high mixing quality, the U-bent pipe mixer caused a pressure drop of 0.5–2.1 % compared to the backpressure of a ballast water treatment system.
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Recommended by Associate Editor Hyoung-gwon Choi
Chanhee Moon is a Ph.D. student at the School of Mechanical Engineering of Pusan National University in Korea. He received his M.S. in Mechanical Engineering from the Pusan National University in 2016. His main research interests are thermal-fluid dynamics in microcellular porous structures for heat exchangers and thermal storages.
Hyun Dong Kim is a Research Professor at the School of Mechanical Engineering of Pusan National University in Korea. He received his Ph.D. in Mechanical Engineering from the Pusan National University in 2012. His main research interest is the development of fluid measurement techniques such as micro-PIV, micro-LIF in micro scale.
Kyung Chun Kim is a Distinguished Professor at the School of Mechanical Engineering of Pusan National University in Korea. He obtained his Ph.D. from the Korea Advanced Institute of Science and Technology (KAIST), Korea, in 1987. He was selected as a Member of the National Academy of Engineering of Korea in 2004. His research interests include flow measurements based on PIV/LIF, POCT development, wind turbines, and organic Rankine cycle system.
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Moon, C., Kim, H.D. & Kim, K.C. Secondary flow mixing of neutralizing reagent induced by U-bent de-ballast pipes. J Mech Sci Technol 33, 2161–2167 (2019). https://doi.org/10.1007/s12206-019-0418-7
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DOI: https://doi.org/10.1007/s12206-019-0418-7