Heat transfer during transition from film to nucleate boiling of water in force convection upward flow

An experimental facility was employed to perform fundamental quenching experiments under simple conditions with the aim of providing sufficient transient boiling data for comparison with steady state data. A thin-walled heater tube of 316 stainless steel material was chosen as the test section. The test section was completely dried out and heated to temperatures beyond the Leidenfrost point before being flooded from the bottom with subcooled water. The following ranges of parameters were investigated: 700-1000 F initial wall temperature, 90-215 psia pressure, 20-172 F fluid subcooling at inlet, and 700,000-1,900,000 lbm/hr-sq ft coolant inlet mass velocity. In addition to the transient boiling data, single phase forced convection and nucleate boiling data were collected on the test section at steady state conditions.