Attenuation of Temperature Fluctuations in Thermal Striping

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概要

• 論文の詳細を見る

• Thermal striping is random temperature fluctuation generated by the mixing of flow streams at different temperatures. In a liquid-metal-cooled fast breeder reactor (LMFBR), it occurs in the upper plenum as a result of the mixing of sodium coolant jets from fuel assemblies and control rods. It is necessary to consider the temperature cycling in the context of fatigue on the component. A simplified model has been developed to analyze the attenuation of tempera- ture fluctuations from the flow streams to the structure surface. The analytical results were compared with experiments that simulated the upper core structure and impinging jets from fuel sub-assemblies and control rod channels in an LMFBR. Sodium and water were used as simulated fluids to examine the differences in their physical properties. The surface attenuation ratio decreased with the jet flow velocity. The ratio of surface temperature fluctuation to fluid temperature fluctuation is 30-80% in water tests and is 20-50% in sodium tests. These experimental attenuation values almost agreed with the values calculated by the boundary layer theory.

• 社団法人 日本原子力学会の論文
• 1995-08-25

著者

• WAKAMATSU Mitsuo

  Toshiba Corp.

• Wakamatsu Mitsuo

  Toshiba Nuclear Engineering Laboratory Toshiba Corporation

• NEI Hiromichi

  Toshiba Nuclear Engineering Laboratory, Toshiba Corporation

• HASHIGUCHI Koh

  Toshiba Nuclear Engineering Laboratory, Toshiba Corporation

• Nei Hiromichi

  Toshiba Nuclear Engineering Laboratory Toshiba Corporation

• Hashiguchi Koh

  Toshiba Nuclear Engineering Laboratory Toshiba Corporation

関連論文

• ICONE11-36208 STUDY ON HIGH-CYCLE FATIGUE EVALUATION FOR THERMAL STRIPING IN MIXING TEES WITH HOT AND COLD WATER (1) : Type A : Characteristics of temperature fluctuations and heat transfer in collision-type mixing tees with same pipe diameters (1)
• ICONE11-36182 STUDY ON HIGH-CYCLE FATIGUE EVALUATION FOR THERMAL STRIPING IN MIXING TEES WITH HOT AND COLD WATER (2) : TYPE B; CHARACTERISTICS OF TEMPERATURE FLUCTUATIONS AND HEAT TRANSFER IN MIXING TEES WITH SAME PIPE DIAMETERS
• Attenuation of Temperature Fluctuations in Thermal Striping

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