Thermal and rheological behaviour of stearate-based phase change nanofluids

Jose I. Prado; María Elena Navarro; Uxía Calviño; Yulong Ding; Luis Lugo

doi:10.1016/j.molliq.2023.122293

Thermal and rheological behaviour of stearate-based phase change nanofluids

Jose I. Prado^*, María Elena Navarro^*, Uxía Calviño, Yulong Ding, Luis Lugo

^*Corresponding author for this work

Chemical Engineering

Research output: Contribution to journal › Article › peer-review

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Abstract

A comprehensive study has been performed on the thermal and rheological behaviour of two sets of isooctyl stearate (PureTemp 8, PT8) based nanofluids with different concentrations of spherical MgO nanoparticles (up to 15 wt%) and graphene nanoplatelets (up to 2 wt%). The results show that the presence of the nanomaterials does not significantly alter the phase change temperatures of the base fluids, although the latent heat decreases by 27% and 7.6% for 15 wt% MgO and 1.0 wt% GnP-based nanofluids, respectively. Both nanomaterials are found to increase the thermal diffusivity of the nanofluids. GnP-based suspensions have a higher thermal diffusivity than the MgO ones at similar nanomaterial concentrations. Rheological analyses show that MgO-PT8 nanofluids behave as a viscoplastic material (solid at zero shear rate); whereas the GnP-PT8 samples are viscoelastic (liquid at zero shear rate). MgO nanoparticles promote the formation of large fractal agglomerates, leading to a strong gel network of particles within PT8, while platelet-shaped GnP gives a fluid-like behaviour.

Original language	English
Article number	122293
Number of pages	12
Journal	Journal of Molecular Liquids
Volume	385
Early online date	12 Jun 2023
DOIs	https://doi.org/10.1016/j.molliq.2023.122293
Publication status	Published - 1 Sept 2023

Bibliographical note

Funding Information:
This work was supported by the “Ministerio de Economía y Competitividad” (Spain) and FEDER program through the ENE2017-86425-C2-1-R project. Grant PID2020-112846RB-C21 funded by MCIN/AEI/10.13039/501100011033. Grant PDC2021-121225-C21 funded by MCIN/AEI/10.13039/501100011033 and by “European Union NextGenerationEU/PRTR”. The authors acknowledge the financial support by the Xunta de Galicia (Spain) through GRC ED431C 2020/06 Program. This work was also partially supported by COST Action CA15119: Overcoming Barriers to Nanofluids Market Uptake (Nanouptake) in the framework of the Short-Term Scientific Mission program. J.I.P. acknowledges the financial support by the Ministerio de Universidades (Spain) under budgetary implementation 33.50.460A.752 and by the European Union NextGenerationEU/PRTR through a Margarita Salas postdoctoral contract of the Universidade de Vigo (Spain). U.C. acknowledges the financial support from “Agencia Estatal de Investigación” under predoctoral grant PRE2021-097589. Funding for open access charge: Universidade de Vigo/CISUG.

Publisher Copyright:
© 2023 The Author(s)

Keywords

Graphene nanoplatelets
Magnesium oxide nanoparticles
Nanofluids
Phase change materials (PCM)
Rheological behaviour
Thermal diffusivity

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics
Spectroscopy
Physical and Theoretical Chemistry
Materials Chemistry

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Cite this

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title = "Thermal and rheological behaviour of stearate-based phase change nanofluids",

abstract = "A comprehensive study has been performed on the thermal and rheological behaviour of two sets of isooctyl stearate (PureTemp 8, PT8) based nanofluids with different concentrations of spherical MgO nanoparticles (up to 15 wt%) and graphene nanoplatelets (up to 2 wt%). The results show that the presence of the nanomaterials does not significantly alter the phase change temperatures of the base fluids, although the latent heat decreases by 27% and 7.6% for 15 wt% MgO and 1.0 wt% GnP-based nanofluids, respectively. Both nanomaterials are found to increase the thermal diffusivity of the nanofluids. GnP-based suspensions have a higher thermal diffusivity than the MgO ones at similar nanomaterial concentrations. Rheological analyses show that MgO-PT8 nanofluids behave as a viscoplastic material (solid at zero shear rate); whereas the GnP-PT8 samples are viscoelastic (liquid at zero shear rate). MgO nanoparticles promote the formation of large fractal agglomerates, leading to a strong gel network of particles within PT8, while platelet-shaped GnP gives a fluid-like behaviour.",

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note = "Funding Information: This work was supported by the “Ministerio de Econom{\'i}a y Competitividad” (Spain) and FEDER program through the ENE2017-86425-C2-1-R project. Grant PID2020-112846RB-C21 funded by MCIN/AEI/10.13039/501100011033. Grant PDC2021-121225-C21 funded by MCIN/AEI/10.13039/501100011033 and by “European Union NextGenerationEU/PRTR”. The authors acknowledge the financial support by the Xunta de Galicia (Spain) through GRC ED431C 2020/06 Program. This work was also partially supported by COST Action CA15119: Overcoming Barriers to Nanofluids Market Uptake (Nanouptake) in the framework of the Short-Term Scientific Mission program. J.I.P. acknowledges the financial support by the Ministerio de Universidades (Spain) under budgetary implementation 33.50.460A.752 and by the European Union NextGenerationEU/PRTR through a Margarita Salas postdoctoral contract of the Universidade de Vigo (Spain). U.C. acknowledges the financial support from “Agencia Estatal de Investigaci{\'o}n” under predoctoral grant PRE2021-097589. Funding for open access charge: Universidade de Vigo/CISUG. Publisher Copyright: {\textcopyright} 2023 The Author(s)",

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AU - Navarro, María Elena

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AU - Lugo, Luis

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Thermal and rheological behaviour of stearate-based phase change nanofluids

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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