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Secondary flow mixing of neutralizing reagent induced by U-bent de-ballast pipes

Authors
  • Moon, Chanhee1
  • Kim, Hyun Dong2
  • Kim, Kyung Chun1
  • 1 Pusan National University, School of Mechanical Engineering, Busan, 46241, Korea , Busan (South Korea)
  • 2 Pusan National University, Rolls-Royce and Pusan National University Technology Centre, Busan, 46241, Korea , Busan (South Korea)
Type
Published Article
Journal
Journal of Mechanical Science and Technology
Publisher
Korean Society of Mechanical Engineers
Publication Date
May 08, 2019
Volume
33
Issue
5
Pages
2161–2167
Identifiers
DOI: 10.1007/s12206-019-0418-7
Source
Springer Nature
Keywords
License
Yellow

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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