thermo physical

Thermo physical properties of nanofluids
The current study focuses the effect of oxidized multiwalled carbon nanotube dispersion in ethylene glycol–water mixtures on thermal conductivity and dynamic viscosity. The indirect assessment of heat transfer characteristics of the nanofluids is carried out from physico -thermal properties through Mouromtseff number (Mo). The base fluids comprise of all volume proportions of ethylene glycol - water combinations, with the volume percentage of ethylene glycol ranging from 100% to 0% for intended use in both for automotive and solar thermal applications. To achieve highest stability in EG-Water combinations, the MWCNTs are oxidised and dispersed in weight fractions of 0.05, 0.1, 0.25, and 0.5. For two months, the stability of nanofluids was assessed using UV-Vis spectroscopic analysis. There is a substantial surge in thermal conductivity of all samples in the range of 15 to 24 percent when MWCNTs are dispersed in the base fluids. A data set of 1500 points for all cases of temperatures, mass fractions, percentage of ethylene glycol is taken and correlations for thermal conductivity and dynamic viscosity have been proposed. After analysis of thermo-physical properties using Mouromtseff number (Mo), Dilute nanofluids with low concentration were shown to have the highest heat transfer capability under turbulent flow.