Abstract
In a nuclear power plant, one of the important issues is evaluation of the safety of reactor core and its pipes when an earthquake occurs Many researchers have conducted studies on constructions of plants Consequently, there is some knowledge about earthquake-resisting designs However the influence of an earthquake vibration on thermal fluid inside a nuclear reactor plant is not fully understood The aim of this study is to clarify the influence of vibration of construction on bubbly flow structure In order to investigate it, we visualize changing of bubbly flow structure in pipeline on which sine wave is applied It was clarified that the behavior of liquid phase and bubble through horizontal circular pipes was affected by an oscillation. The periodical fluctuation of liquid phase and bubble velocity and bubble shape were indicated
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