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Experimental Study on Fluid Mixing for Evaluation of Thermal Striping in T-Pipe Junction

[+] Author Affiliations
Minoru Igarashi, Masaaki Tanaka, Hideki Kamide

Japan Nuclear Cycle Development Institute, O-arai, Ibaraki, Japan

Shigeyo Kawashima

Nuclear Energy System Incorporation, O-arai, Ibaraki, Japan

Paper No. ICONE10-22255, pp. 383-390; 8 pages
  • 10th International Conference on Nuclear Engineering
  • 10th International Conference on Nuclear Engineering, Volume 3
  • Arlington, Virginia, USA, April 14–18, 2002
  • Conference Sponsors: Nuclear Engineering Division
  • ISBN: 0-7918-3597-9 | eISBN: 0-7918-3589-8
  • Copyright © 2002 by ASME


A water experiment is performed to investigate thermal striping phenomena in a T-pipe junction which is a typical geometry of fluid mixing. The flow velocity ratio and temperature difference were experimental parameters. The jet form was classified into four patterns; (1) impinging jet, (2) deflecting jet, (3) re-attachment jet and (4) wall jet according to the inflow condition. The parameter experiments showed that the jet form could be predicted by a momentum ratio between the two pipes. The thermochromic liquid crystal sheet showed that a cold spot was formed at the wall surface in the main pipe in the cases of the impinging jet and the wall jet. From the temperature measurement in the fluid, temperature fluctuation intensity was high along the edge of the jet exiting from branch piping. A database of temperature fluctuation and frequency characteristics was established for an evaluation rule of thermal striping in a T-pipe junction.

Copyright © 2002 by ASME
Topics: Fluids , Pipes , Junctions



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