抄録
Experiments and statistical analysis were carried out to study the effect of cooling rate and surface area on freezing temperature of supercooled water attached to a heat transfer surface. Electrolytically polished copper disk was used and experiments were carried out under three kinds of fixed cooling rates (0.05K/s, 0.2K/s & 0.8K/s). In a case of experiments under high cooling rate, non-uniform temperature distribution existed on the surface, so the analytical method introduced in the former paper could not be applied. Hence another method was introduced here. The heat transfer surface was divided into a few parts so that in each part a temperature distribution on the surface kept uniform. The probability for the whole surface was taken as a combination of the probability for each part. By using this method, the probability of ice appearance within a unit surface area in unit time interval was calculated for each series of cooling rate. The results were compared and was observed that the probability of ice appearance was independent of the cooling rate and the area used for the experiment. Hence the reliability of using the method to predict the most probable freezing temperature of supercooled water introduced in this paper was clarified.
