Abstrakt

Effect of nano particles on electrical conductivity and viscosity subject to a cyclic temperature pattern

Basudeb Chakraborty

The paper investigates the effect of thermal loading on viscosity and electrical conductivity of weakly dosed nanofluids. Two types of thermal loadings are examined: (a) a continuous increasing loading from sub-ambient 5ï‚°Cto 40ï‚°C, (b) a heating (5ï‚°Cï‚®45ï‚°C) followed by cooling (45ï‚°Cï‚®5ï‚°C) loading. Results show that electrical conductivity is weakly dependent on thermal loading and is strongly dependent on nano-particle type. Viscosity shows a strong relationship with thermal loading but is weakly nano-particle dependent. Both electrical conductivity and viscosity show weak hysteresis during the cyclic thermal loading for low dosages. This finding is in contrast for a strong hysteresis pattern reported by Nguyen et al.[1] for highly dosed nanofluids.