Investigations of the freezing behaviour of molten core materials

The freezing behaviour of single phase oxide melts in high quality steel structures is characterized in all the examined conditions (driving pressure <1 MPa, hydraulic diameter <6 mm), particularly for heated structures, which melt instantaneously on contact with the hot melt, by the fact that a stable oxide crust forms on the wall of the flow channel, which prevents mixing of the molten steel with the oxide melt in the case of wall melting. The existence of stable crusts was proved on sections by subsequent examination. An indirect proof is the good agreement of different parameters, particularly the depth of penetration, with the results of PLUGM-KfK. This code is based on the conduction controlled freezing model, the important assumption of which is a stable crust. (orig./RB)