障害物を含む鉛直ダクト内高速流中における小気泡の運動(流体工学,流体機械)

概要

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Several experiments have reported that Departure from Nucleate Boiling (DNB) in a Pressurized Water Reactor (PWR) fuel assembly often takes place in upstream part of a grid spacer, and it was supposed that bubble accumulation induced by flow around an obstacle is one of reasons of the DNB inception. Hence, experiments were conducted to investigate the motion of small bubbles in high-speed flows in a vertical duct containing an obstacle. The bubble trajectories and averaged bubble distributions were measured by an image processing method. The experimental results indicated that small bubbles migrate toward the opposite wall of the obstacle near the upstream edge of the obstacle. The lateral translation of bubbles was larger than that of the liquid phase, which could be induced by the difference in inertia between bubbles and the liquid phase.
社団法人日本機械学会の論文
2007-01-25