1001 主配管の枝管におけるキャビティーフローに関する基礎研究

概要

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Cavity flow may occur at a branch pipe of a main pipe. Thermal stratification and temperature fluctuation may occur when the cavity flow reaches the bend of the branch pipe. The purpose of this study is to clarify these phenomena by visualization, and the flow patterns and the distances of their transition points were classified. Adiabatic experimental studies were carried out by using a vertical straight pipe and a bent pipe with a horizontal section as a branch pipe connecting to a main pipe where the flow velocity was up to 15m/s. Flow patterns were divided into three regions. The experimental results were similar for both pipes. The third flow pattern connecting to the stagnant water is a spiral flow fluctuating with an interval of several tens seconds. It was estimated that this fluctuation might cause the temperature fluctuation in diabatic system.