Prediction of dryout and post-burnout heat transfer with axially non-uniform heat input by means of an annular flow model

A phenomenological model of annular flow/post burnout heat transfer has been tested against data from experiments with axial heat flux variations by Becker et al. (Department of Nuclear Reactor Engineering Report KTH-NEL-54, 1992). This article reports results from that exercise and identifies some important variables and areas where improvements to the model are required.