Experimental study on stability of ZnO, TiO2, F-MWCNT based mono and hybrid nanofluid.

In this research article investigation was done on the stability of ZnO, TiO2, F-MWCNT based mono and hybrid nanofluid using a mixture of distilled water & ethylene glycol (E.G.) as a base fluid. Most of the research works highlighted the properties of nanofluid. Hence stability of nanofluid is studied in this research work. Mono and hybrid nanofluid were formed by the use of a two-step method with various vol. fraction without use of surfactant. Sedimentation photograph capturing method and Zeta potential test used for stability analysis. 0.1% vol. concentration of nanoparticles shows good dispersion in the base fluid. Sedimentation of nanoparticles observed with increase in vol. concentration of nanoparticles and time. The Zeta potential values were observed in the range of 20 - 34.4 mV for a 0.1% vol. fraction of mono nanofluid and 29.3mV for hybrid nanofluid, which indicates that nanofluid has moderate stability. So low vol. concentration nanoparticles in hybrid nanofluid will be a promising coolant for heat transfer application, as a small amount of addition of nanoparticles of F-MWCNT along with ZnO and TiO2 will help to increase the thermal conductivity of hybrid nanofluid. [ABSTRACT FROM AUTHOR]