Add to ORKGThis is a fundamental analytical and numerical study of the thermodynamic aspects of energy conversion during the sudden thermal interaction between melt particles that are initially dispersed through a body of saturated liquid water. The study is constituted as a sequence of models that proceed from the simplest toward the more complex. In the first model it is shown that the immediate thermal contact between water and hot surface leads to high supercritical pressures, and prevents the formation of steam at the interface. The pressure decays, and steam forms as the time increases. Steam is incorporated in the second model, where each melt particle is a sphere coated by a steam annulus and immersed in water. The mixture expands in one direc...