Abstract
The rheological behaviour of ethylene glycol-based nanofluids containing hexagonal scalenohedral-shaped α-Fe2O3 (hematite) nanoparticles at 303.15 K and particle weight concentrations up to 25% has been carried out using a cone-plate Physica MCR rheometer. The tests performed show that the studied nanofluids present non-Newtonian shear-thinning behaviour. In addition, the viscosity at a given shear rate is time dependent, i.e. the fluid is thixotropic. Finally, using strain sweep and frequency sweep tests, the storage modulus G', loss modulus G″ and damping factor were determined as a function of the frequency showing viscoelastic behaviour for all samples.
Highlights
Research on nanofluids characterization has progressed remarkably in the last decade [1,2,3,4,5,6,7,8]
Following our previous research on nanofluids [22,23,24,25], we present experimental evidence of non-Newtonian behaviour of nanofluids obtained by dispersing hematite (Fe2O3) nanoparticles in ethylene glycol (EG)
With the aim to check the operation of this rheometer using a cone-plate geometry and at shear rates up to 1,000 s-1 in the flow curves, initial experiments based on flow curves at controlled shear stress were carried out for pure EG, diisodecyl phthalate (DiDP) and polyalpha olefin (PAO-40)
Summary
Research on nanofluids characterization has progressed remarkably in the last decade [1,2,3,4,5,6,7,8]. Following our previous research on nanofluids [22,23,24,25], we present experimental evidence of non-Newtonian behaviour of nanofluids obtained by dispersing hematite (Fe2O3) nanoparticles in ethylene glycol (EG). These ferrofluids are termed as smart functional fluids, due to some of its unique features, manifesting simultaneously fluid and magnetic properties, and have found applications in mechanical engineering, aerospace and bioengineering [26,27].
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