CRITICAL HEAT FLUXES FOR CURVED SURFACES DURING SUBCOOLED FLOW BOILING.

Experimental and analytical studies of the critical heat flux for subcooled flows of freon 113 over concave, convex and straight surfaces have been conducted. Correlation functions for the critical heat flux, developed from an idealized model of a vapor bubble cycle, have been evaluated and compared with data collected in an experimental apparatus constructed as part of this investigation. Details of the apparatus design and operating procedures are given. Results of the critical heat flux experiments are reported and summarized in tabular form. The primary conclusion of the investigation was that concave surfaces permit substantially higher critical heat fluxes than straight surfaces which, in turn, permit somewhat higher critical heat fluxes than convex surfaces.