Staff View: Water-based graphene quantum dots dispersion as a high-performance long-term stable nanofluid for two-phased closed thermosyphons

Water-based graphene quantum dots dispersion as a high-performance long-term stable nanofluid for two-phased closed thermosyphons

Water-based graphene quantum dots (GQD) suspension has great potential for different heat transfer applications as a novel coolant due to their unique colloidal stability, high thermal conductivity and low penalty for rheological properties once loading GQD. To this end, graphene quantum dots were f...

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Main Authors:	Soleymaniha, Mohammadreza, Amiri, Ahmad, Shanbedi, Mehdi, Chew, Bee Teng, Wongwises, Somchai
Format:	Article
Published:	Elsevier 2018
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://eprints.um.edu.my/20639/ https://doi.org/10.1016/j.icheatmasstransfer.2018.05.009
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spelling	my.um.eprints.206392019-03-11T04:21:28Z http://eprints.um.edu.my/20639/ Water-based graphene quantum dots dispersion as a high-performance long-term stable nanofluid for two-phased closed thermosyphons Soleymaniha, Mohammadreza Amiri, Ahmad Shanbedi, Mehdi Chew, Bee Teng Wongwises, Somchai TJ Mechanical engineering and machinery Water-based graphene quantum dots (GQD) suspension has great potential for different heat transfer applications as a novel coolant due to their unique colloidal stability, high thermal conductivity and low penalty for rheological properties once loading GQD. To this end, graphene quantum dots were firstly prepared through a new and cost-effective exfoliation procedure. Based on the morphological characterization, the average thickness and diameter of the synthesized amine treated-GQD (AGQD) were determined as mostly less than 1 nm and in the range of 5–20 nm, respectively. Case studies show that water-based AGQD nanofluid at very low weight fractions shows a considerably higher thermal conductivity than that of base fluid. In a detailed rheological investigation of the water-based AGQD nanofluid, no noteworthy increase was observed in comparison with the base fluid, which is considered as a major benefit for this novel generation of coolants. The water-based AGQD nanofluids were also found to be especially more effective in the thermosyphon in terms of overall thermal properties such as net heat transfer, and thermal efficiency, and rheological property such as effective viscosity, as well as, total pressure drop in comparison to the distilled water. Since the water-based AGQD nanofluids show no sedimentation, high thermal conductivity and fairly no effect on rheological properties, it would provide an economical approach for enhancing the performance of industrial heat pipes and thermosyphons. Elsevier 2018 Article PeerReviewed Soleymaniha, Mohammadreza and Amiri, Ahmad and Shanbedi, Mehdi and Chew, Bee Teng and Wongwises, Somchai (2018) Water-based graphene quantum dots dispersion as a high-performance long-term stable nanofluid for two-phased closed thermosyphons. International Communications in Heat and Mass Transfer, 95. pp. 147-154. ISSN 0735-1933 https://doi.org/10.1016/j.icheatmasstransfer.2018.05.009 doi:10.1016/j.icheatmasstransfer.2018.05.009
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/
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Soleymaniha, Mohammadreza Amiri, Ahmad Shanbedi, Mehdi Chew, Bee Teng Wongwises, Somchai Water-based graphene quantum dots dispersion as a high-performance long-term stable nanofluid for two-phased closed thermosyphons
description	Water-based graphene quantum dots (GQD) suspension has great potential for different heat transfer applications as a novel coolant due to their unique colloidal stability, high thermal conductivity and low penalty for rheological properties once loading GQD. To this end, graphene quantum dots were firstly prepared through a new and cost-effective exfoliation procedure. Based on the morphological characterization, the average thickness and diameter of the synthesized amine treated-GQD (AGQD) were determined as mostly less than 1 nm and in the range of 5–20 nm, respectively. Case studies show that water-based AGQD nanofluid at very low weight fractions shows a considerably higher thermal conductivity than that of base fluid. In a detailed rheological investigation of the water-based AGQD nanofluid, no noteworthy increase was observed in comparison with the base fluid, which is considered as a major benefit for this novel generation of coolants. The water-based AGQD nanofluids were also found to be especially more effective in the thermosyphon in terms of overall thermal properties such as net heat transfer, and thermal efficiency, and rheological property such as effective viscosity, as well as, total pressure drop in comparison to the distilled water. Since the water-based AGQD nanofluids show no sedimentation, high thermal conductivity and fairly no effect on rheological properties, it would provide an economical approach for enhancing the performance of industrial heat pipes and thermosyphons.
format	Article
author	Soleymaniha, Mohammadreza Amiri, Ahmad Shanbedi, Mehdi Chew, Bee Teng Wongwises, Somchai
author_facet	Soleymaniha, Mohammadreza Amiri, Ahmad Shanbedi, Mehdi Chew, Bee Teng Wongwises, Somchai
author_sort	Soleymaniha, Mohammadreza
title	Water-based graphene quantum dots dispersion as a high-performance long-term stable nanofluid for two-phased closed thermosyphons
title_short	Water-based graphene quantum dots dispersion as a high-performance long-term stable nanofluid for two-phased closed thermosyphons
title_full	Water-based graphene quantum dots dispersion as a high-performance long-term stable nanofluid for two-phased closed thermosyphons
title_fullStr	Water-based graphene quantum dots dispersion as a high-performance long-term stable nanofluid for two-phased closed thermosyphons
title_full_unstemmed	Water-based graphene quantum dots dispersion as a high-performance long-term stable nanofluid for two-phased closed thermosyphons
title_sort	water-based graphene quantum dots dispersion as a high-performance long-term stable nanofluid for two-phased closed thermosyphons
publisher	Elsevier
publishDate	2018
url	http://eprints.um.edu.my/20639/ https://doi.org/10.1016/j.icheatmasstransfer.2018.05.009
_version_	1643691336736440320
score	13.211869

Water-based graphene quantum dots dispersion as a high-performance long-term stable nanofluid for two-phased closed thermosyphons

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