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ISSN Online: 2688-7231

ISBN Online: 978-1-56700-524-0

Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
December, 17-20, 2021, IIT Madras, Chennai, India

A comparative assessment of Ag/ZnO hybrid nanofluid with ZnO nanofluid to augment the heat transfer rate during pool boiling

Get access DOI: 10.1615/IHMTC-2021.3820
pages 2527-2533

Abstract

The current work investigates effective heat removal through enhancements in heat transfer coefficient (HTC), critical heat flux (CHF) and other thermal characteristics through the use of nanofluids prepared from ZnO nanoparticles and AgZnO hybrid nanoparticles. Also, a comparative performance analysis of Ag/ZnO hybrid nanofluids, ZnO nanofluids and DI water is done for heat removal through pool boiling. A test piece made from copper with a cylindrical geometry of 20 mm diameter was deployed as a heating surface for experimentation.
Preparation of stable nanofluids through an ultra-sonicator involved stable dispersion of the hybrid nanoparticles in base fluid at concentrations (∅): 0.02%, 0.06% and 0.1% for boiling experiments. During pool boiling experimentation, the increased concentration of nanoparticles led to the elevation of crucial parameters like CHF and HTC. Excellent gains (~180%) in HTC and (~66%) in CHF were seen at ∅ = 0.1% for Ag/ZnO hybrid nanofluids than DI water and considerably higher than the enhancements through ZnO nanofluids. Any attempt to increase the nanofluid concentration above ∅ > 0.1% stalled further heat transfer.
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