液柱分離再結合時の圧力上昇

概要

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In a system of pipeline liquid transportation, liquid column separation occurs when the difference of pipeline elevations between the highest and the lowest becomes larger than 10 m. If a liquid is forced to flow in the pipeline under this condition, the cavity formed due to the liquid column separation collapses, and as a result, an extraordinary large pressure rise can occur. This phenomenon is very harmful for the liquid transportation system. In this paper, the behavior of liquid column separation collapse, is clarified and the velocity of liquid column collapses was derived from the macroscopic mechanical energy balance equations. As a result, experimental values of maximum pressure rise and required time for liquid column collapses were in good agreement with those obtained using the derived quations mentioned above.