Investigation of transient critical heat flux phenomena and forced convection film boiling heat transfer

As a part of German safety program, transient heat transfer experiments have been performed at the blowdown heat transfer test facility by the Kraftwerk Union company in Karlstein. The purpose of these experiments was to investigate the transient critical heat flux phenomena and the forced convective film boiling heat transfer coefficients. Post experimental analysis has been performed by Gesellschaft fur Reaktorsicherheit using the computer code BRUDI-VA, a modified version of blowdown code BRUCH-D. The purpose of this investigation was the calculation of local thermal hydraulic parameters and the evaluation of different correlations used in the analysis of reactor safety problems for the calculation of maximum and minimum critical heat flux and forced convection film boiling heat transfer coefficients. Using the results of analysis a new equilibrium two component correlation for the calculation of forced convective film boiling heat transfer coefficients has been developed. This correlation is shown to agree well with the experimental data