Void fraction under high pressure, low flow conditions in rod bundle geometry ☆
暂无分享,去创建一个
Abstract Void-fraction data are reported from a series of high pressure, low heat and mass flux experiments. Testing was performed in a heated vertical rod bundle with internal dimensions similar to a PWR fuel bundle. The results are of interest in analyses of small break loss of coolant accidents. The experiments showed that, at a given pressure, void-fraction data could be fitted to a drift-flux equation with a constant drift-velocity. The drift-velocity was observed to decrease with increasing pressure and was independent of void fraction; a characteristic normally associated with churn-turbulent flow. However, relevant drift-flux correlations found in the literature gave relatively poor predictions of void fraction. The best predictions were obtained from an empirical correlation based on dimensional analysis.
[1] R. J. Miller,et al. Experimental investigations of uncovered-bundle heat transfer and two-phase mixture-level swell under high-pressure low heat-flux conditions. [PWR] , 1982 .
[2] J. P. Cunningham,et al. Experiments and void correlation for PWR small-break LOCA conditions , 1973 .
[3] N. Zuber,et al. Average volumetric concentration in two-phase flow systems , 1965 .