一体型舶用炉の横揺れ自然循環における炉心部熱伝達特性

概要

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A series of natural circulation experiments, using a physical model of an integrated type marine reactor mounted on a rolling bed, was performed in order to investigate effects of the ship motion on heat transfer characteristics in the core. The experiments were conducted at several different rolling periods, core heater power levels and amplitudes of the rolling motion. At the beginning, the average Nusselt numbers at upright attitude were compared with other experimental data. The present data agree well with El-Genk's natural convection data within 10 percent. Then, heat transfer rates in slant situation of the core were examined. The average Nusselt numbers at inclined attitudes have not differed any noticeably from those at upright attitude with the angles of inclination |θ|<π<8. Finally, heat transfer characteristics in the core were investigated for the rolling motion. It has been found that the heat transfer is enhanced by the motion and its change is well correlated with the Richardson number for rolling motion Ri_R = Gr^*/Re_R^2. The heat transfer during the rolling motion is classified into the following three regimes; (a) in the range of 0.05<Ri_R<0.3, the heat transfer is dominated by the inertia force due to the rolling motion, (b) 0.3<Ri_R<2, by both of the natural convection and inertia force due to the rolling motion, and (c) 2<Ri_R <11, by the natural convection.
1999-05-19