Check out this neat animation created in COMSOL multiphysics software that studies the film boiling of water. The "Leidenfrost point" referred to is the lowest temperature at which a hot body submerged in a pool of boiling water is completely blanketed by a vapor film. There is a minimum in the heat flux from the body to the water at this temperature. The animation shows the fluids volume fraction over time as a surface and contour plot. In CFD, volume of fluid (VOF) method is a numerical technique for tracking and locating the free surface (or fluid-fluid interface).