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Performance dependence of thermosyphon on the functionalization approaches: An experimental study on thermo-physical properties of graphene nanoplatelet-based water nanofluids

Graphene Nanoplatelets (GNP) were stably dispersed in aqueous media by covalent and non-covalent functionalization. Covalent functionalization was performed by a rapid microwave-assisted approach. Surface functionality groups and morphology of acid-treated GNP were analyzed by Fourier transform infr...

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Main Authors:	Amiri, A., Sadri, R., Shanbedi, M., Ahmadi, G., Chew, B.T., Kazi, Salim Newaz, Dahari, Mahidzal
Format:	Article
Language:	English
Published:	Elsevier 2015
Subjects:	T Technology (General) TJ Mechanical engineering and machinery TP Chemical technology
Online Access:	http://eprints.um.edu.my/13881/1/Performance_dependence_of_thermosyphon_on_the.pdf http://eprints.um.edu.my/13881/ http://www.sciencedirect.com/science/article/pii/S0196890414010905
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spelling	my.um.eprints.138812019-09-05T07:46:55Z http://eprints.um.edu.my/13881/ Performance dependence of thermosyphon on the functionalization approaches: An experimental study on thermo-physical properties of graphene nanoplatelet-based water nanofluids Amiri, A. Sadri, R. Shanbedi, M. Ahmadi, G. Chew, B.T. Kazi, Salim Newaz Dahari, Mahidzal T Technology (General) TJ Mechanical engineering and machinery TP Chemical technology Graphene Nanoplatelets (GNP) were stably dispersed in aqueous media by covalent and non-covalent functionalization. Covalent functionalization was performed by a rapid microwave-assisted approach. Surface functionality groups and morphology of acid-treated GNP were analyzed by Fourier transform infrared spectroscopy and transmission electron microscopy. The GNP-based water nanofluids were then prepared with different concentrations of GNP to evaluate the thermo-physical and rheological properties. It was found that the rheological and thermo-physical properties of all treated samples were significantly enhanced compared to the pure water. The amount of enhancement also increased as the weight concentration increased. Thermo-physical results also confirmed that the thermal conductivity varied significantly depending on the functionalization approaches. At a constant concentration, the measurement showed that the thermal conductivity of covalent nanofluid (GNP-COOH/water) is larger than the non-covalent nanofluid (GNP-SDBS/water), which is larger than distilled water. The GNP-COOH/water nanofluids were found to be especially more effective in the thermosyphon in terms of overall thermal properties such as net heat transfer, entropy, and thermal efficiency, and rheological property such as effective viscosity, as well as, total pressure drop in comparison to GNP-SDBS/water nanofluids and certainly distilled water. The relative degradation of thermal conductivity and heat transfer efficiency of non-covalent nanofluids (GNP-SDBS/water) is due to the reduction of effective heat transfer surface of GNP nanoparticles in suspension, implying lower formation of surface nanolayers. Since the covalent functionalization with microwave radiation is a fast and cost-effective, it would provide an economical approach for industrial applications, an environmentally friendly alternative to the surfactant methods. (C) 2014 Elsevier Ltd. All rights reserved. Elsevier 2015-03-01 Article PeerReviewed application/pdf en http://eprints.um.edu.my/13881/1/Performance_dependence_of_thermosyphon_on_the.pdf Amiri, A. and Sadri, R. and Shanbedi, M. and Ahmadi, G. and Chew, B.T. and Kazi, Salim Newaz and Dahari, Mahidzal (2015) Performance dependence of thermosyphon on the functionalization approaches: An experimental study on thermo-physical properties of graphene nanoplatelet-based water nanofluids. Energy Conversion and Management, 92. pp. 322-330. ISSN 0196-8904 http://www.sciencedirect.com/science/article/pii/S0196890414010905 doi:10.1016/j.enconman.2014.12.051
institution	Universiti Malaya
building	UM Library
collection	Institutional Repository
continent	Asia
country	Malaysia
content_provider	Universiti Malaya
content_source	UM Research Repository
url_provider	http://eprints.um.edu.my/
language	English
topic	T Technology (General) TJ Mechanical engineering and machinery TP Chemical technology
spellingShingle	T Technology (General) TJ Mechanical engineering and machinery TP Chemical technology Amiri, A. Sadri, R. Shanbedi, M. Ahmadi, G. Chew, B.T. Kazi, Salim Newaz Dahari, Mahidzal Performance dependence of thermosyphon on the functionalization approaches: An experimental study on thermo-physical properties of graphene nanoplatelet-based water nanofluids
description	Graphene Nanoplatelets (GNP) were stably dispersed in aqueous media by covalent and non-covalent functionalization. Covalent functionalization was performed by a rapid microwave-assisted approach. Surface functionality groups and morphology of acid-treated GNP were analyzed by Fourier transform infrared spectroscopy and transmission electron microscopy. The GNP-based water nanofluids were then prepared with different concentrations of GNP to evaluate the thermo-physical and rheological properties. It was found that the rheological and thermo-physical properties of all treated samples were significantly enhanced compared to the pure water. The amount of enhancement also increased as the weight concentration increased. Thermo-physical results also confirmed that the thermal conductivity varied significantly depending on the functionalization approaches. At a constant concentration, the measurement showed that the thermal conductivity of covalent nanofluid (GNP-COOH/water) is larger than the non-covalent nanofluid (GNP-SDBS/water), which is larger than distilled water. The GNP-COOH/water nanofluids were found to be especially more effective in the thermosyphon in terms of overall thermal properties such as net heat transfer, entropy, and thermal efficiency, and rheological property such as effective viscosity, as well as, total pressure drop in comparison to GNP-SDBS/water nanofluids and certainly distilled water. The relative degradation of thermal conductivity and heat transfer efficiency of non-covalent nanofluids (GNP-SDBS/water) is due to the reduction of effective heat transfer surface of GNP nanoparticles in suspension, implying lower formation of surface nanolayers. Since the covalent functionalization with microwave radiation is a fast and cost-effective, it would provide an economical approach for industrial applications, an environmentally friendly alternative to the surfactant methods. (C) 2014 Elsevier Ltd. All rights reserved.
format	Article
author	Amiri, A. Sadri, R. Shanbedi, M. Ahmadi, G. Chew, B.T. Kazi, Salim Newaz Dahari, Mahidzal
author_facet	Amiri, A. Sadri, R. Shanbedi, M. Ahmadi, G. Chew, B.T. Kazi, Salim Newaz Dahari, Mahidzal
author_sort	Amiri, A.
title	Performance dependence of thermosyphon on the functionalization approaches: An experimental study on thermo-physical properties of graphene nanoplatelet-based water nanofluids
title_short	Performance dependence of thermosyphon on the functionalization approaches: An experimental study on thermo-physical properties of graphene nanoplatelet-based water nanofluids
title_full	Performance dependence of thermosyphon on the functionalization approaches: An experimental study on thermo-physical properties of graphene nanoplatelet-based water nanofluids
title_fullStr	Performance dependence of thermosyphon on the functionalization approaches: An experimental study on thermo-physical properties of graphene nanoplatelet-based water nanofluids
title_full_unstemmed	Performance dependence of thermosyphon on the functionalization approaches: An experimental study on thermo-physical properties of graphene nanoplatelet-based water nanofluids
title_sort	performance dependence of thermosyphon on the functionalization approaches: an experimental study on thermo-physical properties of graphene nanoplatelet-based water nanofluids
publisher	Elsevier
publishDate	2015
url	http://eprints.um.edu.my/13881/1/Performance_dependence_of_thermosyphon_on_the.pdf http://eprints.um.edu.my/13881/ http://www.sciencedirect.com/science/article/pii/S0196890414010905
_version_	1646210133416476672
score	13.211869

Performance dependence of thermosyphon on the functionalization approaches: An experimental study on thermo-physical properties of graphene nanoplatelet-based water nanofluids

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