Rheology and thermal conductivity of non-porous silica (SiO2) in viscous glycerol and ethylene glycol based nanofluids

Nanofluids are advanced fluids with novel properties useful for diverse applications in heat transfer. This article reports the experimental determination of thermal conductivity and viscosity for silica (SiO2) nanofluids in ethylene glycol (EG) and glycerol (G) as base fluids. A two-step method was...

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Main Authors: Akilu, S., Baheta, A.T., Minea, A.A., Sharma, K.V.
Format: Article
Institution: Universiti Teknologi Petronas
Record Id / ISBN-0: utp-eprints.19298 /
Published: Elsevier Ltd 2017
Online Access: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85030682045&doi=10.1016%2fj.icheatmasstransfer.2017.08.001&partnerID=40&md5=29fee82a12a177ef6cd64f2818f1cc0a
http://eprints.utp.edu.my/19298/
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spelling utp-eprints.192982018-05-03T02:10:21Z Rheology and thermal conductivity of non-porous silica (SiO2) in viscous glycerol and ethylene glycol based nanofluids Akilu, S. Baheta, A.T. Minea, A.A. Sharma, K.V. Nanofluids are advanced fluids with novel properties useful for diverse applications in heat transfer. This article reports the experimental determination of thermal conductivity and viscosity for silica (SiO2) nanofluids in ethylene glycol (EG) and glycerol (G) as base fluids. A two-step method was applied to disperse the nanoparticles in the base fluids for the particle volume concentration of 0.5–2.0. The dispersion stability of the nanofluids was evaluated by zeta potential analysis. All the measurements were performed in the temperature interval from 30 °C to 80 °C. It was found that the thermal conductivity increases with temperature. The SiO2-EG showed higher conductivity enhancement than SiO2-G nanofluids. Rheological analyses confirm Newtonian behavior for silica nanofluids within shear rate range of 20–100 s− 1. Viscosity decreases with an increase in operating temperature. The SiO2-EG demonstrated very weak temperature dependence compared to the SiO2-G nanofluids. Based on these measured properties, the criterion for heat transfer performance was determined. Furthermore, equations have been proposed with accuracy within ± 10 deviations to predict the thermal conductivity and dynamic viscosity of EG and G-based SiO2 nanofluids. © 2017 Elsevier Ltd Elsevier Ltd 2017 Article PeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-85030682045&doi=10.1016%2fj.icheatmasstransfer.2017.08.001&partnerID=40&md5=29fee82a12a177ef6cd64f2818f1cc0a Akilu, S. and Baheta, A.T. and Minea, A.A. and Sharma, K.V. (2017) Rheology and thermal conductivity of non-porous silica (SiO2) in viscous glycerol and ethylene glycol based nanofluids. International Communications in Heat and Mass Transfer, 88 . pp. 245-253. http://eprints.utp.edu.my/19298/
institution Universiti Teknologi Petronas
collection UTP Institutional Repository
description Nanofluids are advanced fluids with novel properties useful for diverse applications in heat transfer. This article reports the experimental determination of thermal conductivity and viscosity for silica (SiO2) nanofluids in ethylene glycol (EG) and glycerol (G) as base fluids. A two-step method was applied to disperse the nanoparticles in the base fluids for the particle volume concentration of 0.5–2.0. The dispersion stability of the nanofluids was evaluated by zeta potential analysis. All the measurements were performed in the temperature interval from 30 °C to 80 °C. It was found that the thermal conductivity increases with temperature. The SiO2-EG showed higher conductivity enhancement than SiO2-G nanofluids. Rheological analyses confirm Newtonian behavior for silica nanofluids within shear rate range of 20–100 s− 1. Viscosity decreases with an increase in operating temperature. The SiO2-EG demonstrated very weak temperature dependence compared to the SiO2-G nanofluids. Based on these measured properties, the criterion for heat transfer performance was determined. Furthermore, equations have been proposed with accuracy within ± 10 deviations to predict the thermal conductivity and dynamic viscosity of EG and G-based SiO2 nanofluids. © 2017 Elsevier Ltd
format Article
author Akilu, S.
Baheta, A.T.
Minea, A.A.
Sharma, K.V.
spellingShingle Akilu, S.
Baheta, A.T.
Minea, A.A.
Sharma, K.V.
Rheology and thermal conductivity of non-porous silica (SiO2) in viscous glycerol and ethylene glycol based nanofluids
author_sort Akilu, S.
title Rheology and thermal conductivity of non-porous silica (SiO2) in viscous glycerol and ethylene glycol based nanofluids
title_short Rheology and thermal conductivity of non-porous silica (SiO2) in viscous glycerol and ethylene glycol based nanofluids
title_full Rheology and thermal conductivity of non-porous silica (SiO2) in viscous glycerol and ethylene glycol based nanofluids
title_fullStr Rheology and thermal conductivity of non-porous silica (SiO2) in viscous glycerol and ethylene glycol based nanofluids
title_full_unstemmed Rheology and thermal conductivity of non-porous silica (SiO2) in viscous glycerol and ethylene glycol based nanofluids
title_sort rheology and thermal conductivity of non-porous silica (sio2) in viscous glycerol and ethylene glycol based nanofluids
publisher Elsevier Ltd
publishDate 2017
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-85030682045&doi=10.1016%2fj.icheatmasstransfer.2017.08.001&partnerID=40&md5=29fee82a12a177ef6cd64f2818f1cc0a
http://eprints.utp.edu.my/19298/
_version_ 1741196184602542080
score 11.62408

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