Direct-contact heat-transfer characteristics between a melted alloy and water

As a candidate for an innovative steam generator for fast-breeder reactors, a heat exchanger with direct-contact heat transfer between a melted alloy and water was proposed. The evaluation of heat-transfer characteristics of this heat exchanger is one of the research subjects for the design and development of the steam generator. In this study, the effect of pressure on the heat-transfer characteristics and the required degree of superheating of the melted alloy above water-saturation temperatures are evaluated during the direct-contact heat-transfer experiment by injecting water into Wood's alloy. In the experiment, the pressure, the temperature of Wood's alloy, the flow rate of feed water, and the depth of the feed-water injection point are varied as parameters. As a result of the experiment, the product of the degree of Wood's alloy superheating above the water-saturation temperature and the depth of the feed-water injection point is constant for each pressure. This constant increases as the pressure rises