New Viscosity Data for CuO-Water Nanofluid – The Hysteresis Phenomenon Revisited

Abstract:

In the present work, we have experimentally investigated the stability and hysteresis behaviors of CuO-water nanofluid when submitted to a repeated heating and cooling process. Data has shown that for a low particle volume concentration, 1.6% in particular, the hysteresis phenomenon did not occur for the temperature range considered. For a higher particle concentration, 5% in particular, the hysteresis behaviour was clearly observed when fluid temperature exceeded 52°C approximately. Beyond this critical temperature, the nanofluid viscosity has increased, and such an increase even continued with a decrease of temperature during the cooling phase. Subsequent measured viscosity and observations in laboratory after the first occurrence of the hysteresis phenomenon have confirmed that the alterations on the particle suspension and on the nanofluid stability appear indeed permanent. Such alterations were found to worsen with further heating/cooling cycles.

• Periodical: Advances in Science and Technology (Volume 81)
• Pages: 101-106
• DOI: https://doi.org/10.4028/www.scientific.net/AST.81.101
• Online since: September 2012
• Authors: Cong Tam Nguyen, Nicolas Galanis, Thierry Maré, Erwan Eveillard
• Keywords: CuO-Water Nanofluid, Dynamic Viscosity, Hysteresis, Nanofluid, Stability, Thermal Property

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