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ISBN : 978-1-56700-478-6

Proceedings of the 24th National and 2nd International ISHMT-ASTFE Heat and Mass Transfer Conference (IHMTC-2017)
2017, December 27-30 , BITS Pilani, Hyderabad, India

POOL BOILING CHARACTERISTICS OF REDUCED GRAPHENE OXIDE NANO-FLUID OVER A FLAT PLATE HEATER

Get access DOI: 10.1615/IHMTC-2017.2420
pages 1743-1746

Abstract

The pool boiling heat transfer characteristics 10-5%, 10-4%, 10-3%, 10-2 % and 10-1% by weight concentrations of reduced Graphene Oxide (rGO) nanofluid has been studied. Different rGO nanofluids were prepared in de-ionized water. The pool boiling heat transfer data were acquired for the boiling of nano-fluids over a 30mm square and 0.44mm thick copper plate heater under atmospheric pressure. The Critical Heat Flux (CHF) of de-ionized water was measured on a nanoparticle coated surface which was produced during the pool boiling experiments of nanofluids. The results show that the CHFs of various nanofluids are significantly enhanced over that of de-ionized water. The result clearly shows that the main cause for CHF enhancement of nano-fluids is the modification of the heating surface by the nanoparticle deposition. In a present study, rGO have been characterized through atomic force microscopy (AFM), X-Ray diffraction (XRD), Scanning electron microscopy (SEM) and surface roughness. Thermal conductivity of rGO nanofluids for different concentration is reported and the heat transfer coefficient of nano-fluid reduces while CHF increases. Finally, CHF enhancement of nanofluids is discussed using the parameters.
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