Influence of ultrasonification energy on the dispersion consistency of Al2O3-glycerol nanofluid based on viscosity data, and model development for the required ultrasonification energy density

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dc.contributor.author Adio, Saheed Adewale
dc.contributor.author Sharifpur, Mohsen
dc.contributor.author Meyer, Josua P.
dc.date.accessioned 2015-11-16T07:11:13Z
dc.date.issued 2016
dc.description.abstract Achieving homogenised and stable suspensions have been one of the important research topics in nanofluid investigations. Preparing nanofluids, especially from the two–step method is often accompanied with varying degrees of agglomerations depending on some parameters. These parameters include the physical structure of the nanoparticle, the prevalent particle charge, strength of van der Waals forces of attraction and repulsiveness strength. Amongst the methods of deagglomeration, the use of ultrasonic vibration is the most popular for achieving uniform dispersion. However, there are very few works related to its effect on the thermo-physical properties of nanofluids and above all, standardizing the minimum required ultrasonication time/energy for nanofluids synthesis. In this work, the optimum energy required for uniform and initially stable nanofluid has been investigated through experimental study on the combined influence of ultrasonication time/energy, nanoparticle size, volume fraction and temperature on the viscosity of alumina-glycerol nanofluids. Three different sizes of alumina nanoparticles were synthesised with glycerol using ultrasonication assisted two-step approach. The viscosities of the nanofluid samples were measured between temperatures of 20-70 oC for volume fractions up to 5%. Based on the present experimental results, the viscosity characteristics of the nanofluids samples were dependent on particle size, volume fraction and working temperature. Using viscometry, the optimum energy density required for preparing homogenous nanofluid was obtained for all particles sizes and volume fractions. Lastly, an energy density model was derived using dimensionless analysis based on the consideration of nanoparticles binding/interaction energy in base fluid, particle size, volume fraction, temperature and other base fluid properties. The model’s empirical constants were obtained using nonlinear regression based on the present experimental data. en_ZA
dc.description.embargo 2016-11-05
dc.description.librarian hb2015 en_ZA
dc.description.sponsorship National Research Foundation of South Africa (NRF), Stellenbosch University/University of Pretoria Solar Hub, CSIR, EEDSM Hub, NAC and RDP. en_ZA
dc.description.uri http://www.tandfonline.com/loi/tjen20 en_ZA
dc.identifier.citation Saheed A. Adio, Mohsen Sharifpur & Josua P. Meyer (2016) Influence of ultrasonication energy on the dispersion consistency of Al2O3–glycerol nanofluid based on viscosity data, and model development for the required ultrasonication energy density, Journal of Experimental Nanoscience, 11:8, 630-649, DOI: 10.1080/17458080.2015.1107194. en_ZA
dc.identifier.issn 1745-8080 (print)
dc.identifier.issn 1745-8099 (online)
dc.identifier.issn http://orcid.org/0000-0002-3675-5494 (Josua P. Meyer)
dc.identifier.other 10.1080/17458080.2015.1107194
dc.identifier.other http://orcid.org/0000-0002-2732-1360 (Saheed A. Adio)
dc.identifier.uri http://hdl.handle.net/2263/50478
dc.language.iso en en_ZA
dc.publisher Taylor and Francis en_ZA
dc.rights © 2015 Taylor and Francis. This is an electronic version of an article published in Journal of Experimental Nanoscience, vol. 11, no. 8, pp. 630-649, 2016. doi : 10.1080/17458080.2015.1107194. Journal of Experimental Nanoscience is available online at : http://www.tandfonline.com/loi/tjen20. en_ZA
dc.subject Nanofluids en_ZA
dc.subject Optimum ultrasonication en_ZA
dc.subject Aluminium oxide-glycerol en_ZA
dc.subject Energy density en_ZA
dc.subject Viscosity en_ZA
dc.title Influence of ultrasonification energy on the dispersion consistency of Al2O3-glycerol nanofluid based on viscosity data, and model development for the required ultrasonification energy density en_ZA
dc.type Postprint Article en_ZA


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