Temperature fluctuation caused by mixing the fluids with different temperature in a T-junction pipe gives eventually thermal fatigue to structure, and this phenomenon is significant as safety issue in liquid metal cooled fast reactor (LMFBR). In Japan Nuclear Cycle Development Institute (JNC), experimental and numerical investigations have been performed to clarify the mixing phenomena in the T-junction pipe and to establish an evaluation rule for design. If the T-junction pipe is set near an elbow pipe, turbulence mixing is surly affected by the secondary flow generated in the elbow pipe and it is necessary to study the influence of the secondary flow on the temperature fluctuation in the T-junction pipe. We carried out investigation into the secondary flow effect by numerical simulation using a quasi-direct numerical simulation code. Numerical simulation is conducted on the existing experiment, in which the test section simulated the T-junction pipe with the elbow pipe in LMFBR. Major parameter in the numerical simulation is the flow direction of the branch pipe to the flow direction of the elbow pipe. We discuss the influences of the secondary flow on turbulent mixing behavior, and also clarify the mixing mechanism in T-junction pipe.
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ASME/JSME 2004 Pressure Vessels and Piping Conference
July 25–29, 2004
San Diego, California, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
0-7918-4684-9
PROCEEDINGS PAPER
Numerical Simualtion of Turbulence Mixing Characteristic in Various Secondary Flow Conditions at T-Junction Piping Systems
Masa-aki Tanaka,
Masa-aki Tanaka
Japan Nuclear Cycle Development Institute, O-arai, Ibaraki, Japan
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Toshiharu Muramatsu
Toshiharu Muramatsu
Japan Nuclear Cycle Development Institute, O-arai, Ibaraki, Japan
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Masa-aki Tanaka
Japan Nuclear Cycle Development Institute, O-arai, Ibaraki, Japan
Toshiharu Muramatsu
Japan Nuclear Cycle Development Institute, O-arai, Ibaraki, Japan
Paper No:
PVP2004-3028, pp. 35-42; 8 pages
Published Online:
August 12, 2008
Citation
Tanaka, M, & Muramatsu, T. "Numerical Simualtion of Turbulence Mixing Characteristic in Various Secondary Flow Conditions at T-Junction Piping Systems." Proceedings of the ASME/JSME 2004 Pressure Vessels and Piping Conference. Problems Involving Thermal Hydraulics, Liquid Sloshing, and Extreme Loads on Structures. San Diego, California, USA. July 25–29, 2004. pp. 35-42. ASME. https://doi.org/10.1115/PVP2004-3028
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