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Rheological behavior of mechanically stabilized and surfactant-free MWCNT-thermal oil-based nanofluids

The viscosity of nanofluids is one of the important parameter for the design of heat transfer processes. The evolution of usage of nanofluids in heat transfer processes is gaining more industrial consideration due to excellent thermal properties. However, limited attention is focused on the rheologi...

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Main Authors: Ilyas, S.U., Pendyala, R., Narahari, M.
Format: Article
Published: Elsevier Ltd 2017
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-85028002562&doi=10.1016%2fj.icheatmasstransfer.2017.07.015&partnerID=40&md5=82b0d454c1f7f6520d1a880dc9f1e65d
http://eprints.utp.edu.my/19317/
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spelling my.utp.eprints.193172018-04-24T02:35:58Z Rheological behavior of mechanically stabilized and surfactant-free MWCNT-thermal oil-based nanofluids Ilyas, S.U. Pendyala, R. Narahari, M. The viscosity of nanofluids is one of the important parameter for the design of heat transfer processes. The evolution of usage of nanofluids in heat transfer processes is gaining more industrial consideration due to excellent thermal properties. However, limited attention is focused on the rheological behavior of nanofluids as of today. The multiwall carbon nanotubes (MWCNTs) are stabilized in thermal oil using ultrasonication and high stability is observed. The rheological behavior of thermal-oil based dispersant-free nanofluids are studied at varying high shear rates (100–2000 s− 1), temperatures (25–90 °C) and nanoparticle concentrations (0.1–1 wt). The effect on the shear stress and viscosity by the addition of carbon nanotubes in thermal oil is discussed. The measured effective viscosity is compared with different theoretical conventional models. A significant increment in relative viscosity is observed at high concentrations of carbon nanotubes. A correlation is developed based on the temperature, nanomaterial concentration, and shear rate. © 2017 Elsevier Ltd Elsevier Ltd 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85028002562&doi=10.1016%2fj.icheatmasstransfer.2017.07.015&partnerID=40&md5=82b0d454c1f7f6520d1a880dc9f1e65d Ilyas, S.U. and Pendyala, R. and Narahari, M. (2017) Rheological behavior of mechanically stabilized and surfactant-free MWCNT-thermal oil-based nanofluids. International Communications in Heat and Mass Transfer, 87 . pp. 250-255. http://eprints.utp.edu.my/19317/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
description The viscosity of nanofluids is one of the important parameter for the design of heat transfer processes. The evolution of usage of nanofluids in heat transfer processes is gaining more industrial consideration due to excellent thermal properties. However, limited attention is focused on the rheological behavior of nanofluids as of today. The multiwall carbon nanotubes (MWCNTs) are stabilized in thermal oil using ultrasonication and high stability is observed. The rheological behavior of thermal-oil based dispersant-free nanofluids are studied at varying high shear rates (100–2000 s− 1), temperatures (25–90 °C) and nanoparticle concentrations (0.1–1 wt). The effect on the shear stress and viscosity by the addition of carbon nanotubes in thermal oil is discussed. The measured effective viscosity is compared with different theoretical conventional models. A significant increment in relative viscosity is observed at high concentrations of carbon nanotubes. A correlation is developed based on the temperature, nanomaterial concentration, and shear rate. © 2017 Elsevier Ltd
format Article
author Ilyas, S.U.
Pendyala, R.
Narahari, M.
spellingShingle Ilyas, S.U.
Pendyala, R.
Narahari, M.
Rheological behavior of mechanically stabilized and surfactant-free MWCNT-thermal oil-based nanofluids
author_facet Ilyas, S.U.
Pendyala, R.
Narahari, M.
author_sort Ilyas, S.U.
title Rheological behavior of mechanically stabilized and surfactant-free MWCNT-thermal oil-based nanofluids
title_short Rheological behavior of mechanically stabilized and surfactant-free MWCNT-thermal oil-based nanofluids
title_full Rheological behavior of mechanically stabilized and surfactant-free MWCNT-thermal oil-based nanofluids
title_fullStr Rheological behavior of mechanically stabilized and surfactant-free MWCNT-thermal oil-based nanofluids
title_full_unstemmed Rheological behavior of mechanically stabilized and surfactant-free MWCNT-thermal oil-based nanofluids
title_sort rheological behavior of mechanically stabilized and surfactant-free mwcnt-thermal oil-based nanofluids
publisher Elsevier Ltd
publishDate 2017
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85028002562&doi=10.1016%2fj.icheatmasstransfer.2017.07.015&partnerID=40&md5=82b0d454c1f7f6520d1a880dc9f1e65d
http://eprints.utp.edu.my/19317/
_version_ 1738656052997521408
score 13.211869

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