3527 垂直狭隘環状流路内水-蒸気対向気液二相流の限界熱流束(S49-3 流動,原子炉用機器(2),S49 原子炉システムおよびその要素技術)

概要

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The critical heat fluxes and the temperature excursion heat fluxes of narrow-annular flow passages (d=0.5〜4.0mm) were examined under the counter-current flow condition by using water at 0.2, 0.1, 0.05 and 0.02MPa. As the heat flux was increased, the heat transfer began to deviate from the nucleate boiling first, and then the temperature excursion was initiated. When the clearance was narrow; d=0.5〜2.0mm, water penetration was restricted by upward vapor flow. This restriction was well correlated by the falling film type flooding correlation. When d=4.0mm, the restriction was expressed with the flooding correlation of the mixture level swelling with a falling film. The restriction caused the critical heat flux condition and finally resulted in the temperature excursion. The correlation of the temperature excursion heat fluxes was developed based on the Kutateladze type flooding correlation.
2005-09-18