The effect of TiO2 nanoparticles on fluid quenching characteristics

Župan, Josip and Filetin, Tomislav and Landek, Darko (2012) The effect of TiO2 nanoparticles on fluid quenching characteristics. = The effect of TiO2 nanoparticles on fluid quenching characteristics. International Heat Treatment and Surface Engineering, 6 (2). pp. 56-60. ISSN 1749-5148. Vrsta rada: ["eprint_fieldopt_article_type_article" not defined]. . .

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Abstract

Nanofluids are colloidal suspensions of nanoparticles in base fluids. Some of the particles used in recent research are metal oxide and carbide particles, such as SiC, CuO, Al 2O 3 and TiO 2, graphite and carbon nanotubes and particles. Quenching in such colloids results in better cooling abilities, higher impact toughness and smaller dimension changes of steels, compared with pure quenching media. In this investigation, nanofluids with TiO 2 powders of 50 nm average particle size were investigated. Base fluids of primary interest were deionised (DI) water, some commercial quenching oils and polyalkylene glycol water solution of various polymer concentrations, 5-30 vol.-. The investigated fluids were prepared with the addition of the same TiO 2 powder with different concentrations, from extremely low, 10 mg nanopowder per litre to 1 g L -1. The cooling characteristics of these colloids were compared with the results of base fluids, but also with the results of previous measurements carried out on the fluids with addition of Al 2O 3 micrometre and submicrometre size particles. All of the cooling curves were measured and recorded by the IVF Smart Quench system using a stainless steel probe of 12-5 mm diameter in accordance with ISO 9950 standard. The cooling rate (CR) versus temperature and time was compared for all of the investigated media. The preparation of fluids was conducted with great care, with respect to mechanical stirring and sonification times. The average particle size was measured for each case. In order to better understand the phenomena that occur during the quenching process, a high speed camera was used for recording the experiments. Titanium oxide nanoparticles show the most significant effects on the cooling properties of the water based polymer solution. The maximum cooling rate increases with higher particle concentration. When comparing the results of experiments with alumina particles, smaller and thermally less conductive TiO 2 particles show greater effects on nanofluid properties. © 2012 IHTSE Partnership.

Item Type:	Article (["eprint_fieldopt_article_type_article" not defined])
Keywords (Croatian):	Addition of Al; Alumina particles; Average particle size; Carbide particles; Colloidal suspensions; Cooling characteristics; Cooling curve; Cooling rates; Glycol-water; Maximum cooling; Mechanical stirring; Metal oxides; Nano powders; Nano-fluid; Nanofluids; Oxide nanoparticles; Particle concentrations; Polymer concentrations; Quench systems; Quenching media; Quenching Oil; Quenching process; Sonifications; TiO; Water based; Alumina; Colloids; Cooling; Deionized water; Experiments; Glycols; Metallic compounds; Nanofluidics; Nanoparticles; Particle size; Phase diagrams; Quenching; Silicon carbide; Titanium; Titanium dioxide; Suspensions (fluids)
Subjects:	TECHNICAL SCIENCE
Divisions:	1000 Department of Materials > 1010 Chair of Materials and Tribology 1000 Department of Materials > 1020 Chair of Heat Treatment and Surface Engineering
Indexed in Web of Science:	No
Indexed in Current Contents:	No
Citations SCOPUS:	3 (28.4.2015.)
Date Deposited:	28 Apr 2015 09:34
Last Modified:	28 Apr 2015 09:34
URI:	http://repozitorij.fsb.hr/id/eprint/3953

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