抄録
The mechanism of the transition from a high heat transfer coefficient regime to one of greatly reduced coefficient ("dryout", "burnout", "boiling crisis" or "critical heat flux (CHF)") is closely related to the flow pattern existing at its occurrence. Generally, depending upon local void distributions or quality, the transition mechanism can be divided into two broad categories i.e. those associated with subcooled or low quality conditions and those associated with the drying out of a liquid film in annular flows occurring at higher quality. The work described in this paper is focused on characterization of CHF data on the basis of flow regime map, with particular emphasis on application of specific phenomenological models to predict CHF. For this purpose an annular flow model (Hewitt and Govan, 1990) is selected to predict the CHF in tubes with uniform heating conditions. The predictions are compared with CHF data obtained from the "look up table" of Groeneveld et al (2007) for a range of pressures, mass fluxes and quality values.
