Analysis of natural convection in narrow annular gaps of LMFBR.

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概要

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• The natural convection characteristics of gas in a vertical narrow annular gap which had its bottom opened to high temperature fluid and its upper shielding exposed to low temperature sealant have been evaluated from simulated fluid experiments using water and from calculations using the three-dimensional thermal hydraulic analysis computer code THERVIS-III. The following results were obtained : <BR>(1) The critical Rayleigh number which represented the limit of convection generation increased as the aspect ratios ε<SUB>1</SUB> (height/circumference) and ε<SUB>2</SUB> (height/gap distance) increased. <BR>(2) The flow pattern along the circumferential direction was seen to depend more strongly on the radiant heat from the side wall, rather than the aspect ratios ε<SUB>1</SUB> and ε<SUB>2</SUB>. <BR>(3) The temperature difference along the circumferential direction in the annular gap obtained from the calculation code coincided with that obtained from experiments within +10%, by taking account of a loss in gravitational head difference due to thermal conduction across the side wall which becomes a driving force for natural convection.

• 一般社団法人 日本原子力学会の論文

著者

• Yamakawa Masanori

  Energy Research Laboratory Hitachi Ltd.

• SAKURAI Akio

  Central Research Institute of Electric Power Industry

• SAKAI Takao

  Energy Research Laboratory, Hitachi Ltd.

• KAWASHIMA Hiroaki

  Hitachi Works, Hitachi Ltd.

• HATTORI Sadao

  Central Research Institute of Electric Power Industry

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