Upper Limit of CHF in the Saturated Forced Convection Boiling on a Heated Disk with a Small Impinging Jet

Abstract

Critical heat flux (CHF) in the forced convection boiling on an open heated disk being supplied with saturated liquids through a small high-speed jet impinging at the center of disk is studied experimentally employing Refrigerant 12 at comparatively high pressures from 6.0 to 27.9 bars as well as water and Refrigerant 113 at atmospheric pressure. Generalized correlations of CHF are obtained for two characteristic regimes: V-regime where CHF is variable and I-regime where CHF is invariable for the change of jet velocity. Then, the boundaries of each regime are discussed clarifying the aspects for the lower limit of jet velocity capable of generating I-regime as well as the upper limit of CHF.