Interfacial area concentration measured by the four sensor probes was compared with existing correlations (Fig. 11.5). The vertical axis shows the estimation error between the measured and calculated interfacial area concentration. All the corre­lation overestimates the interfacial area concentration by 50-90 %, which might be caused by the differences in bubble size and shape. Most of the correlations were formulated with air-water two-phase flow data for a bubbly flow regime. However, the bubble shape in a liquid metal two-phase flow might be strongly distorted by the momentum exchange at the gas-liquid interface. Thus, a more appropriate expres­sion of the interfacial area concentration for liquid metal two-phase flow should be developed based on the experimental database.

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