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Tanaka, Masaaki; Murakami, Satoshi; Hibara, Hideki*; Sudo, Kozo*
Proceedings of International Conference on Jets, Wakes and Separated Flows (ICJWSF 2005), p.623 - 627, 2005/10
Numerical simulation to investigate the mixing characteristics in T-junction pipe with turbulence promoter was conducted. T-junction piping system is used to mix the fluids in different temperature. If the temperature fluctuation generated in the mixing process is transmitted to the structure, it can be bring thermal fatigue in the structure. Therefore,
Nagao, Akihiro*; Hibara, Hideki*; Ochi, Junji*; Muramatsu, Toshiharu
JNC TY9400 2004-010, 83 Pages, 2004/07
Flows in T-junction piping system with turbulence promoter have been investigated experimentally using flow visualization techniques (the dye injection method) and velocity measurement by LDV. Effects of turbulent promoter on characteristics of fluid mixing and thermal-striping phenomena are examined. From the experiment, following results are obtained.(1) Arch vortex is formed further than the case without promoter in the upstream station and is rapidly transported to the downstream direction.(2) Secondary flow induced in the cross section become stronger and the diffusion of axial momentum is promoted, as the height of turbulence promoter is higher. (3) Main flow deflects towards to the opposite side of branch pipe at the T-junction, as the height of turbulence promoter is higher, and as velocity ratio becomes smaller, and the flow continues to deflect to a considerably downstream station.(4) Velocity fluctuation is observed in the position where the vortex is formed, and it becomes a maximum at z/Dm=2. In the further downstream, velocity fluctuation decreases with the vortex Flows in T-junction piping system with turbulence promoter have been investigated experimentally using flow visualization techniques (the dye injection method) and velocity measurement by LDV. Effects of turbulent promoter on characteristics of fluid mixing and thermal-striping phenomena are examined. From the experiment, following results are obtained.
Tanaka, Masaaki; Murakami, Satoshi; Hibara, Hideki*; Iwamoto, Yukiharu*
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