FILM BOILING INSTABILITY AT HIGH-TEMPERATURE ON A VERTICAL CYLINDER QUENCHED IN A SUBCOOLED LIQUID

Random explosive destabilization of vapor film-boiling on a surface at 850°C has been observed in subcooled water. The destabilization is induced by a velocity controlled injection of cold water close to the vapor-liquid interface. The destabilization velocity ranges from 0.10 to 2ms-1 depending upon the temperatures of the solid and the liquid. This study shows the quantitative influence of these three parameters and leads to a stability diagram of the film-boiling. The rugosity, the shape and the position of the injection needle affect the stability. The mode of vaporization which follows the destabilization is a high temperature wall wet mode which gives a heat flux near the nucleate boiling flux. © 1979.