For instance, the viscosity of both hybrid (Al 2 O 3 /CNC and Al 2 O 3 /TiO 2 ) nanofluids at all volume concentrations gradually decreased with the increasing temperature and found the lowest at a temperature of 70 °C, whereas the mono nanofluids (Al 2 O 3 , CNC, and TiO 2 ) at all volume concentrations, except 0.1% and 0.5% TiO 2, exhibited the lowest viscosity at a temperature of 50 °C which showed an increasing trend at 70 °C.
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