The prediction methods for dispersed flow film boiling (DFFB) are revi
ewed. The correlation work, based on modifications of the Dittus-Boelt
er correlation for single-phase flow, is discussed first. The merits a
nd limits of this approach are analysed, and the need for more advance
d methods accounting for thermal non-equilibrium is evaluated. The phe
nomenological models aiming to calculate the vapour superheat are disc
ussed, highlighting the assumptions used in their development. Better
predictions are possible by using mechanistic models, where the empiri
cism is shifted to the closure laws. It is shown, however, that even t
he latest models do not consider important phenomena such as droplet b
reak-up and liquid fractions cross-sectional distribution, and this fa
ilure can cause severe errors in the prediction of the cooling effecti
veness of the mixture. Finally, a new model aiming to overcome these l
imitations and based on the Lagrangian description of the droplet hydr
odynamics is briefly outlined.