Mechanism of Critical Heat Flux Enhancement due to Improvement ofSurface Wettability

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This study investigated the saturated pool boiling of water on a 12mm diameter horizontal heating surface coated with TiO2 nanoparticles under atmospheric pressure. The CHF for the TiO2 coated surface increased up to about 2 times the CHF for the uncoated (plain) surface. Liquid-vapor behaviors close to the heating surface were measured using a conductance probe, and the thickness of the macrolayer formed beneath large vapor masses was determined by analyzing the probe signals. It was found that the macrolayers formed on the TiO2 coated surface are thicker than those on the uncoated surface, and this is likely to be one of the causes of the CHF enhancement with the TiO2 coated heating surface.