低圧条件下における垂直下降流の限界熱流束

－管内径および加熱長さの影響－

抄録

Critical Heat Flux (CHF) under downward flow condition have not been fully understood owing to the complex flow structure caused by the counter force between the buoyancy and inertia force. In this study, the influence of tube diameter and heating length on CHF mechanisms in downward flow have been evaluated. As a result, the effect of tube diameter can be explained by using the dominant force regime map coordinated with Bo, We and Fr numbers. In addition, the comparison results of heating length suggested that CHF mechanisms can be determined by the quality condition at the tube exit under stagnation and co-current region.