流動脈動下における再冠水過程の伝熱特性

抄録

Understanding of re-flooding phenomena under oscillatory flow condition is important for the development of emergency core cooling system of a LWR and simplified BWR. In this investigation, the re-flooding experiment was conducted under both steady flow and oscillatory flow forcibly induced by a oscillator installed at downstream of pump. The period and amplitude of oscillation are arbitrary controlled. As the results, the flow pattern has been estimated with an equivalent hydraulic height based on pressure drop, and the heat transfer calculated with one-dimensional heat balance has been evaluated on each flow pattern. The influence of oscillatory flow is clearly appeared in the region of inverted-annular flow not dispersed flow.