EFFECTS OF AL2O3 NANOPARTICLES DEPOSITION ON CRITICAL HEAT FLUX OF R-123 IN FLOW BOILING HEAT TRANSFER

다국어 초록 (Multilingual Abstract)

In this study, R-123 flow boiling experiments were carried out to investigate the effects ofnanoparticle deposition on heater surfaces on flow critical heat flux (CHF) and boiling heattransfer. It is known that CHF enhancement by nanoparticles results from porous structuresthat are very similar to layers of Chalk River unidentified deposit formed on nuclearfuel rod surfaces during the reactor operation period. Although previous studies haveinvestigated the surface effects through surface modifications, most studies are limited topool boiling conditions, and therefore, the effects of porous surfaces on flow boiling heattransfer are still unclear. In addition, there have been only few reports on suppression ofwetting for decoupled approaches of reasoning. In this study, bare and Al2O3 nanoparticlecoatedsurfaces were prepared for the study experiments. The CHF of each surface wasmeasured with different mass fluxes of 1,600 kg/m2s, 1,800 kg/m2s, 2,100 kg/m2s, 2,400 kg/m2s, and 2,600 kg/m2s. The nanoparticle-coated tube showed CHF enhancement up to 17%at a mass flux of 2,400 kg/m2s compared with the bare tube. The factors for CHFenhancement are related to the enhanced rewetting process derived from capillary actionthrough porous structures built-up by nanoparticles while suppressing relative wettabilityeffects between two sample surfaces as a highly wettable R-123 refrigerant was used as aworking fluid.

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