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ISSN Online: 2377-424X

ISBN CD: 1-56700-226-9

ISBN Online: 1-56700-225-0

International Heat Transfer Conference 13
August, 13-18, 2006, Sydney, Australia

CHF ENHANCEMENT IN POOL BOILING OF WATER-TIO2 NANO-FLUIDS: EFFECT OF NANOPARTICLE-COATING ON HEATING SURFACE

Get access (open in a dialog) DOI: 10.1615/IHTC13.p8.220
9 pages

Sinopsis

Pool boiling CHF (critical heat flux) characteristics of nano-fluids were investigated with the different volumetric concentrations of titania nanoparticles. The experiments were carried out using a very thin wire of 0.2 mm diameter under atmospheric pressure. The results indicated that nano-fluids, instead of pure water, as a cooling liquid could vigorously increase the CHF. Subsequent to the pool boiling experiments, the SEM (scanning electron microscope) observation of heater surface revealed that nanoparticles were coated on heating surface during pool boiling of nano-fluids. After that, pool boiling CHF of pure water was measured using a nanoparticle-coated heater which was prepared by pool boiling of nano-fluids on a bare heater. It was founded that the CHF enhancement of nano-fluids was sufficiently achieved by pool boiling of pure water on the naonoparticle-coated heater.