Open AccessA new empirical correlating equation for calculating effective viscosity of nanofluids
Author(s) -
Dhahri Maher,
Aouinet Hana,
sammouda Habib
Publication year - 2019
Publication title -
heat transfer—asian research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.41
H-Index - 30
eISSN - 1523-1496
pISSN - 1099-2871
DOI - 10.1002/htj.21445
Subject(s) - nanofluid , viscosity , materials science , thermodynamics , nanoparticle , relative viscosity , mass fraction , volume fraction , base (topology) , nanotechnology , composite material , mathematics , physics , mathematical analysis
In this paper, an empirical correlation for the nanofluid viscosity is proposed. The new equation for the nanofluid effective dynamic viscosity, normalized by the dynamic viscosity of the base liquid, is derived from a wide selection of experimental data available in the literature. This correlation presented the viscosity of the nanofluid as a function of the base fluid viscosity, nanoparticle volume fraction, nanoparticle diameter, nanoparticle temperature, and mass density of the base fluid. The new correlation was evaluated against 898 experimental data for the viscosities of nanofluid collected from the literature. The experimental data included different working nanofluids, such as alumina, Iron, and silica, where the diameter of nanoparticles was ranging between 10 and 350 nm, suspended in water, propylene glycol, and kerosene. The predicted results were then compared with many other published experimental results for different nanofluids and very good concordance between these results was observed. In general, this correlation has higher accuracy and precision.