Lower Limit Temperature of Homogeneous Nucleation Generation(Thermal Engineering)

Abstract

In either cases that liquid contacts with hot surface or it is rapidly superheated, homogeneous nucleation generation generally occurs in metastable liquid. The model proposed by authors elucidated the homogeneous conditions for both cases. A lower limit temperature under which the homogeneous nucleation never occur, is discussed on the basis of the model. As the result, the lower limit of the temperature on the interface is obtained to be T*_i^=303℃ for any water temperature from 0 to 100℃ at atmospheric pressure. For the case of ramped heating, the homogeneous nucleation generation always appears on the ideal surface without any cavity. In addition, the time at which the homogeneous nucleation generation takes place, strongly depends on the rate of temperature in crease. In additio, the average cluster temperature slightly varies from T_<avg>^*=302 to 313℃ according as the heating rate from 10 to 10^9K/s.