Post-dryout heat transfer of high-pressure steam-water two-phase flow in single rod channel and multi rod bundle

Low flow rate post-dryout heat transfer experiments of steam-water two-phase flow were conducted at the Japan Atomic Energy Research Institute using single rod and 25 rod heat transfer test facilities. The experiments covered mass flow rates from 20 to 800 kg/m2 s, qualities from 0.0 to 1.0 and pressures from 3 to 12 MPa. New correlations for the post-dryout heat transfer coefficient have been proposed by improving the Groeneveld correlation. The proposed correlations can account for the dependence of the heat transfer on the heat transfer surface temperature which the original Groeneveld correlation cannot do explicitly. The agreement between the predicted and measured values is satisfactory. (orig.)