EXPERIMENTAL STUDY ON CHF CHARACTERISTICS OFWATER-TIO2 NANO-FLUIDS

CHF characteristics of nano-fluids were investigated with different volumetric concentrations of TiO2 nanoparticles. Poolboiling experiments indicated that the application of nano-fluids, instead of pure water, as a cooling liquid significantlyincreased the CHF. SEM (scanning electron microscope) observations subsequent to the pool boiling experiments revealedthat nanoparticles were coated on the heating surface during pool boiling of nano-fluids. In order to investigate the roles ofnanoparticles in CHF enhancement of nano-fluids, pool boiling experiments were performed using (a) a nanoparticle-coatedheater, prepared by pool boiling of nano-fluids, immersed in pure water and (b) a nanoparticle-coated heater immersed innano-fluids. The results demonstrated two different roles of nanoparticles in CHF enhancement using nano-fluids: the effectof nanoparticles coated on the heater surface and the effect of nanoparticles suspended in nano-fluids. KCI Citation Count: 4