Viscosity affected by nanoparticle aggregation in Al2O3-water nanofluids
Open Access
- 22 March 2011
- journal article
- Published by Springer Science and Business Media LLC in Nanoscale Research Letters
- Vol. 6 (1), 248
- https://doi.org/10.1186/1556-276x-6-248
Abstract
An investigation on viscosity was conducted 2 weeks after the Al2O3-water nanofluids having dispersants were prepared at the volume concentration of 1-5%. The shear stress was observed with a non-Newtonian behavior. On further ultrasonic agitation treatment, the nanofluids resumed as a Newtonian fluids. The relative viscosity increases as the volume concentrations increases. At 5% volume concentration, an increment was about 60% in the re-ultrasonication nanofluids in comparison with the base fluid. The microstructure analysis indicates that a higher nanoparticle aggregation had been observed in the nanofluids before re-ultrasonication.Keywords
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