Effects of shear rate and temperature on viscosity of alumina polyalphaolefins nanofluids
Identifieur interne : 000401 ( Hal/Corpus ); précédent : 000400; suivant : 000402Effects of shear rate and temperature on viscosity of alumina polyalphaolefins nanofluids
Auteurs : S. Q. Zhou ; R. Ni ; D. FunfschillingSource :
- Journal of Applied Physics [ 0021-8979 ] ; 2010.
English descriptors
- mix :
Abstract
In this paper, the shear rate and temperature dependencies of viscosity of alumina nanofluids have been investigated experimentally. The alumina nanofluids are suspensions of alumina nanospheres or nanorods in polyalphaolefins (PAO) lubricant. The base fluid PAO has a Newtonian behavior. To the first approximation, nanofluids of volume fractions ϕ = 1% and 3% nanospheres as well as nanofluid of ϕ = 1% nanorods can be considered as Newtonian fluids because their viscosity shows very weak shear rate dependence. However, our measurement clearly indicates that these nanofluids demonstrate certain non-Newtonian feature due to the addition of nanoparticles. Moreover, the relative viscosity (the ratio of viscosity of nanofluid to that of PAO) of these nanofluids has been measured to be independent of temperature. Nanofluid of a higher volume fraction ϕ = 3% nanorods has an apparent non-Newtonian shear thinning viscosity and a strong temperature dependence of its relative viscosity. By reviewing the previous studies, the approximation that the viscosity is Newtonian and the relative viscosity is independent of temperature seem to hold for most nanofluids of low volume fraction ϕ and low aspect ratio nanoparticles.
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DOI: 10.1063/1.3309478
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The alumina nanofluids are suspensions of alumina nanospheres or nanorods in polyalphaolefins (PAO) lubricant. The base fluid PAO has a Newtonian behavior. To the first approximation, nanofluids of volume fractions ϕ = 1% and 3% nanospheres as well as nanofluid of ϕ = 1% nanorods can be considered as Newtonian fluids because their viscosity shows very weak shear rate dependence. However, our measurement clearly indicates that these nanofluids demonstrate certain non-Newtonian feature due to the addition of nanoparticles. Moreover, the relative viscosity (the ratio of viscosity of nanofluid to that of PAO) of these nanofluids has been measured to be independent of temperature. Nanofluid of a higher volume fraction ϕ = 3% nanorods has an apparent non-Newtonian shear thinning viscosity and a strong temperature dependence of its relative viscosity. By reviewing the previous studies, the approximation that the viscosity is Newtonian and the relative viscosity is independent of temperature seem to hold for most nanofluids of low volume fraction ϕ and low aspect ratio nanoparticles.</div></front></TEI><hal api="V3"><titleStmt><title xml:lang="en">Effects of shear rate and temperature on viscosity of alumina polyalphaolefins nanofluids</title><author role="aut"><persName><forename type="first">S.Q.</forename><surname>Zhou</surname></persName><email></email><idno type="halauthor">624180</idno><affiliation ref="#struct-161198"></affiliation><affiliation ref="#struct-161199"></affiliation></author><author role="aut"><persName><forename type="first">R.</forename><surname>Ni</surname></persName><email></email><idno type="halauthor">260886</idno><affiliation ref="#struct-161199"></affiliation></author><author role="aut"><persName><forename type="first">D.</forename><surname>Funfschilling</surname></persName><email></email><idno type="halauthor">308570</idno><affiliation ref="#struct-211875"></affiliation></author><editor role="depositor"><persName><forename>Josiane</forename><surname>Moras</surname></persName><email>josiane.moras@ensic.inpl-nancy.fr</email></editor></titleStmt><editionStmt><edition n="v1" type="current"><date type="whenSubmitted">2011-07-07 16:03:50</date><date type="whenModified">2016-05-17 10:14:36</date><date type="whenReleased">2011-07-07 16:03:50</date><date type="whenProduced">2010</date></edition><respStmt><resp>contributor</resp><name key="109516"><persName><forename>Josiane</forename><surname>Moras</surname></persName><email>josiane.moras@ensic.inpl-nancy.fr</email></name></respStmt></editionStmt><publicationStmt><distributor>CCSD</distributor><idno type="halId">hal-00606988</idno><idno type="halUri">https://hal.archives-ouvertes.fr/hal-00606988</idno><idno type="halBibtex">zhou:hal-00606988</idno><idno type="halRefHtml">Journal of Applied Physics, American Institute of Physics, 2010, 107 ((5)), pp. 054317-054317-6. <10.1063/1.3309478></idno><idno type="halRef">Journal of Applied Physics, American Institute of Physics, 2010, 107 ((5)), pp. 054317-054317-6. <10.1063/1.3309478></idno></publicationStmt><seriesStmt><idno type="stamp" n="CNRS">CNRS - Centre national de la recherche scientifique</idno><idno type="stamp" n="LRGP-UL">LRGP</idno><idno type="stamp" n="UNIV-LORRAINE">Université de Lorraine</idno></seriesStmt><notesStmt><note type="audience" n="2">International</note><note type="popular" n="0">No</note><note type="peer" n="1">Yes</note></notesStmt><sourceDesc><biblStruct><analytic><title xml:lang="en">Effects of shear rate and temperature on viscosity of alumina polyalphaolefins nanofluids</title><author role="aut"><persName><forename type="first">S.Q.</forename><surname>Zhou</surname></persName><idno type="halAuthorId">624180</idno><affiliation ref="#struct-161198"></affiliation><affiliation ref="#struct-161199"></affiliation></author><author role="aut"><persName><forename type="first">R.</forename><surname>Ni</surname></persName><idno type="halAuthorId">260886</idno><affiliation ref="#struct-161199"></affiliation></author><author role="aut"><persName><forename type="first">D.</forename><surname>Funfschilling</surname></persName><idno type="halAuthorId">308570</idno><affiliation ref="#struct-211875"></affiliation></author></analytic><monogr><idno type="halJournalId" status="VALID">5853</idno><idno type="issn">0021-8979</idno><idno type="eissn">1089-7550</idno><title level="j">Journal of Applied Physics</title><imprint><publisher>American Institute of Physics</publisher><biblScope unit="volume">107</biblScope><biblScope unit="issue">(5)</biblScope><biblScope unit="pp">pp. 054317-054317-6</biblScope><date type="datePub">2010</date></imprint></monogr><idno type="doi">10.1063/1.3309478</idno></biblStruct></sourceDesc><profileDesc><langUsage><language ident="en">English</language></langUsage><textClass><keywords scheme="author"><term xml:lang="en">alumina</term><term xml:lang="en">nanofluidics</term><term xml:lang="en">polymers</term><term xml:lang="en">suspensions</term><term xml:lang="en">viscosity</term><term xml:lang="en">Shear rate dependent viscosity</term><term xml:lang="en">Emulsions and suspensions</term><term xml:lang="en">Viscosity of liquids</term><term xml:lang="en">diffusive momentum transport</term></keywords><classCode scheme="halDomain" n="spi.gproc">Engineering Sciences [physics]/Chemical and Process Engineering</classCode><classCode scheme="halTypology" n="ART">Journal articles</classCode></textClass><abstract xml:lang="en">In this paper, the shear rate and temperature dependencies of viscosity of alumina nanofluids have been investigated experimentally. The alumina nanofluids are suspensions of alumina nanospheres or nanorods in polyalphaolefins (PAO) lubricant. The base fluid PAO has a Newtonian behavior. To the first approximation, nanofluids of volume fractions ϕ = 1% and 3% nanospheres as well as nanofluid of ϕ = 1% nanorods can be considered as Newtonian fluids because their viscosity shows very weak shear rate dependence. However, our measurement clearly indicates that these nanofluids demonstrate certain non-Newtonian feature due to the addition of nanoparticles. Moreover, the relative viscosity (the ratio of viscosity of nanofluid to that of PAO) of these nanofluids has been measured to be independent of temperature. Nanofluid of a higher volume fraction ϕ = 3% nanorods has an apparent non-Newtonian shear thinning viscosity and a strong temperature dependence of its relative viscosity. By reviewing the previous studies, the approximation that the viscosity is Newtonian and the relative viscosity is independent of temperature seem to hold for most nanofluids of low volume fraction ϕ and low aspect ratio nanoparticles.</abstract></profileDesc></hal></record>Pour manipuler ce document sous Unix (Dilib)
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