Forced convective, nonequilibrium, post-CHF heat transfer experiment data and correlation comparison report

Forced convective, postcritical heat flux heat transfer experiments with water flowing upward in a vertical tube have been conducted at the Idaho National Engineering Laboratory. Thermodynamic nonequilibrium in the form of superheated vapor temperatures was measured at a maximum of three different axial levels. Steady state experiments were conducted at pressures of 0.2 to 0.7 MPa, mass fluxes of 12 to 24 kg/sq ms, heat fluxes of 7.7 to 27.5 kW/sq m, and test section inlet qualities of 38 to 64%. Quasi-steady state (slow moving quench front) experiments were conducted at pressures of 0.4 to 7 MPa, mass fluxes of 12 to 70 kg/sq/s heat fluxes of 8 to 225 kW/sq m, and test section inlet qualities of -7 to 47%. The multiple probe data and the data taken above 0.4 MPa are new data in parameter ranges not previously obtained. Comparison of the data with current vapor generation models and wall heat transfer models yielded unsatisfactory results. This is attributed to the effects of nonequilibrium, quench front quality, and distance from the quench front, which are factors not included in the current models compared.