NDLI: Experimental Measurements of Thermophysical Properties of $$\mathrm{Al}_{2}\mathrm{O}_{3}$$ – and $$\mathrm{TiO}

Content Provider	Springer Nature Link
Author	Longo, Giovanni A. Zilio, Claudio
Copyright Year	2013
Abstract	This paper presents measurements of the thermal conductivity and the dynamic viscosity of $$\mathrm{Al}_{2}\mathrm{O}_{3}$$ –ethylene glycol and $$\mathrm{TiO}_{2}$$ –ethylene glycol (1 % to 3 % particle volume fraction) nanofluids carried out in the temperature range from $$0\,^{\circ }$$ C to $$50\,^{\circ }$$ C. The thermal-conductivity measurements were performed by using a transient hot-disk TPS 2500S apparatus instrumented with a 7577 probe (2.001 mm in radius) having a maximum uncertainty $$(k=2)$$ lower than 5.0 % of the reading. The dynamic-viscosity measurements and the rheological analysis were carried out by a rotating disk type rheometer Haake Mars II instrumented with a single-cone probe (60 mm in diameter and $$1^{\circ }$$ ) having a maximum uncertainty $$(k=2)$$ lower than 5.0 % of the reading. The thermal-conductivity measurements of the tested nanofluids show a great sensitivity to particle volume fraction and a lower sensitivity to temperature: $$\mathrm{TiO}_{2}$$ –ethylene glycol and $$\mathrm{Al}_{2}\mathrm{O}_{3}$$ –ethylene glycol nanofluids show a thermal-conductivity enhancement (with respect to pure ethylene glycol) from 1 % to 19.5 % and from 9 % to 29 %, respectively. $$\mathrm{TiO}_{2}$$ –ethylene glycol and $$\mathrm{Al}_{2}\mathrm{O}_{3}$$ –ethylene glycol nanofluids exhibit Newtonian behavior in all the investigated temperature and particle volume fraction ranges. The relative viscosity shows a great sensitivity to the particle volume fraction and weak or no sensitivity to temperature: $$\mathrm{TiO}_{2}$$ –ethylene glycol and $$\mathrm{Al}_{2}\mathrm{O}_{3}$$ –ethylene glycol nanofluids show a dynamic viscosity increase with respect to ethylene glycol from (4 to 5) % to 30 % and from 14 % to 50 %, respectively. Present experimental measurements were compared both with available measurements carried out by different researchers and computational models for thermophysical properties of nanofluids.
Starting Page	1288
Ending Page	1307
Page Count	20
File Format	PDF
ISSN	0195928X
Journal	International Journal of Thermophysics
Volume Number	34
Issue Number	7
e-ISSN	15729567
Language	English
Publisher	Springer US
Publisher Date	2013-07-23
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Dynamic viscosity Nanofluid Thermal conductivity Condensed Matter Physics Mechanics Industrial Chemistry/Chemical Engineering Physical Chemistry
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics

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