Effect of Sample Start Temperature during Transient Boiling Water Heat Transfer

The influence of the initial sample start temperature (400 °C to 1000 °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.