Experimental study of heat transfer under flow boiling ozone-safe refrigerants in microchannels

Abstract

Abstract This paper devoted to experimental measurement of heat transfer and critical heat fluxes into horizontal microchannels under flow boiling of refrigerant 141b. The copper experimental test section contains two microchannels with a 2x0.36 mm cross-section. Average heat fluxes versus wall superheat in the range of mass fluxes from 600 to 2100 kg/m2s and heat fluxes up to 140 W/cm2 are presented. A slight deterioration in heat transfer relative to pool boiling with heat fluxes close to critical was observed.