K-2209 熱交換器縮流部における減圧沸騰現象(J14-3 沸騰伝熱)(J14 & J11 & J12 原子力利用技術と熱問題)

概要

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In heat exchangers of power plants, tube supports may be exposed to scale deposition. As the explanation for this phenomenon, flashing is said to be one of the factor. In this study, flashing at the leading edge of contraction in a rectangular flow path were observed. Pressure drop and steam void characteristics at the flashing occurrence point were measured. The phenomenon were also investigated by photographs. Between two types of contraction, with same contraction ratio and different hydraulic diameter, considerable difference of boundary temperature of flashing occurrence were seen. Most of the bubbles detected at the leading edge of contraction were very small while those at the upstream included bubbles of many sizes.
社団法人日本機械学会の論文
2001-08-22