A Photographic Study of Subcooled Flow Boiling and the Boiling Crisis in Freon-113.

摘要

The paper concerns an experimental investigation of the causal mechanisms in the subcooled flow boiling crisis. Freon-113was used at moderate pressures of 100to 350psia to model water at high pressures of 800to 2500psia. This range includes the 2250psia operating pressure of pressurized water nuclear reactors. The research was motivated by the fact that there are no completely acceptable theoretical models of the departure from nucleate boiling (DNB) in subcooled flow boiling. To improve understanding of DNB and to facilitate the development of general theories to predict the critical heat flux it was necessary to disclose the detailed features of the two-phase flow regime and the changes,if any,in these features at the time of the boiling crisis. Photography was chosen as the experimental technique that could best accomplish that objective. (Author)