Burnout and Heat-Transfer Correlations for Once-Through Superheat at Low Flow with an Exponential Source

Burnout and heat-transfer correlations have been obtained from experimental data in a ‘Once-Through Superheat’ channel with an exponential heat distribution. Such an electrically heated channel permits local heat fluxes to approach burnout limits in order to maximize total heat input to a test section. Data as a function of the process variables include burnout heat flux in the high quality region and superheat production from 0 to 235°F. The range of the independent process variables are: pressure, 520 to 1900 lb/in.² (gage); flow, 0.0108 to 0.242 × 10⁶ lb/h-ft², and subcooling from 0 to 327°F. Several comparisons with data in the literature including one for high quality film boiling are made.