Experimental investigations of the viscosity of nanofluids at low temperatures

► Experimental viscosity of two nanofluids (Al2O3; CNTs) at low temperatures. ► Viscosity hysteresis phenomenon showing thixotropy. ► Shearing time influence. ► Non-Newtonian behaviour of Al2O3 water nanofluid. ► Newtonian behaviour of CNT water based nanofluid at high shear rate. The effects due to...

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Bibliographic Details
Published in:Applied energy 2012-09, Vol.97, p.876-880
Main Authors: Aladag, Bahadir, Halelfadl, Salma, Doner, Nimeti, Maré, Thierry, Duret, Steven, Estellé, Patrice
Format: Article
Language:English
Subjects:
Alumina
aluminum oxide
Applied sciences
Carbon nanotubes
Condensed Matter
Energy
Exact sciences and technology
Hysteresis
Materials Science
Nanofluid
nanofluids
Physics
Rheology
rheometers
shear stress
temperature
Viscosity
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Summary:► Experimental viscosity of two nanofluids (Al2O3; CNTs) at low temperatures. ► Viscosity hysteresis phenomenon showing thixotropy. ► Shearing time influence. ► Non-Newtonian behaviour of Al2O3 water nanofluid. ► Newtonian behaviour of CNT water based nanofluid at high shear rate. The effects due to temperature and shearing time on viscosity for Al2O3/water and CNT/water based nanofluids at low concentration and low temperatures are experimentally investigated. The viscosity data were collected using a stress-controlled rheometer equipped with parallel plate geometry under up and down shear stress ramp. CNT and Al2O3 water based nanofluids exhibited hysteresis behaviour when the stress is gradually loaded and unloaded, depending also on shearing time. Experiments also showed that the nanofluid suspensions indicated either Newtonian or non-Newtonian behaviour, depending on shear rate. CNT water based nanofluid behaves as Newtonian fluid at high shear rate whereas Al2O3 water based nanofluid is non-Newtonian within the range of low temperatures investigated.
ISSN:0306-2619
1872-9118
DOI:10.1016/j.apenergy.2011.12.101