Effect of sample start temperature during transient boiling water heat transfer

The influence of the initial sample start temperature (400 degrees C to 1000 degrees C) on the boiling water heat-transfer behavior during quenching of AISI 316 stainless steel plates has been examined. The study involved instrumenting 280-mm-diameter, 12.7-mm-(0.5-in.-) thick plates with seven subsurface thermocouples (TCs) placed at various locations across the diameter and spraying water onto the surface using a circular cone spray nozzle placed directly above the plate surface. The measured temperature-time history at each location was then input to a two-dimensional (2-D) axisymmetric inverse heat conduction (IHC) model so that the boiling curves for each test condition could be determined. The study has demonstrated that the initial sample temperature has a significant effect on the shape and magnitude of the boiling curve during transient cooling conditions. A. simple method is proposed to approximately capture the influence of sample start temperature on transient boiling water behavior that alleviates the need to conduct multiple measurements.