Cover Image

Graphene nanoplatelets–silver hybrid nanofluids for enhanced heat transfer

In the present experimental work, a new synthesis method is introduced for decoration of silver on the functionalized graphene nanoplatelets (GNP-Ag) and preparation of nanofluids is reported. The thermo-physical properties, heat transfer performance and friction factor for fully developed turbulent...

Full description

Saved in:
Bibliographic Details
Main Authors: Yarmand, H., Gharehkhani, S., Ahmadi, G., Shirazi, S.F.S., Baradaran, S., Montazer, E., Zubir, M.N.M., Alehashem, M.S., Kazi, S.N., Dahari, M.
Format: Article
Published: Elsevier 2015
Subjects:
Q Science (General)
QD Chemistry
TJ Mechanical engineering and machinery
Online Access:http://eprints.um.edu.my/19393/
http://dx.doi.org/10.1016/j.enconman.2015.05.023
Tags: Add Tag
No Tags, Be the first to tag this record!
id my.um.eprints.19393
record_format eprints
spelling my.um.eprints.193932018-09-25T02:58:00Z http://eprints.um.edu.my/19393/ Graphene nanoplatelets–silver hybrid nanofluids for enhanced heat transfer Yarmand, H. Gharehkhani, S. Ahmadi, G. Shirazi, S.F.S. Baradaran, S. Montazer, E. Zubir, M.N.M. Alehashem, M.S. Kazi, S.N. Dahari, M. Q Science (General) QD Chemistry TJ Mechanical engineering and machinery In the present experimental work, a new synthesis method is introduced for decoration of silver on the functionalized graphene nanoplatelets (GNP-Ag) and preparation of nanofluids is reported. The thermo-physical properties, heat transfer performance and friction factor for fully developed turbulent flow of GNP-Ag/water nanofluids flowing through a circular tube at a constant heat flux were investigated. GNP-Ag uniform nanocomposite was produced from a simple chemical reaction procedure, which includes acid treatment for functionalization of GNP. The surface characterization was performed by various techniques such as XRD, FESEM, TEM and Raman. The GNP-Ag nanofluids were prepared by dispersing the nanocomposite in distilled water without the assistance of a surfactant and/or ultrasonication. The prepared nanofluids were found to be stable and no sedimentation was observed for a long time. The experimental data for GNP-Ag nanofluids were shown improvements of effective thermal conductivity and heat transfer efficiency in comparison with the corresponding to the base-fluid. The amount of enhancement was a function of temperature and weight concentration of nanoparticles. Maximum enhancement of Nusselt number was 32.7% with a penalty of 1.08 times increase in the friction factor for the weight concentration of 0.1% at a Reynolds number of 17,500 compared to distilled water. Improved empirical correlations were proposed based on the experimental data for evaluation of Nusselt number and friction factor. Elsevier 2015 Article PeerReviewed Yarmand, H. and Gharehkhani, S. and Ahmadi, G. and Shirazi, S.F.S. and Baradaran, S. and Montazer, E. and Zubir, M.N.M. and Alehashem, M.S. and Kazi, S.N. and Dahari, M. (2015) Graphene nanoplatelets–silver hybrid nanofluids for enhanced heat transfer. Energy Conversion and Management, 100. pp. 419-428. ISSN 0196-8904 http://dx.doi.org/10.1016/j.enconman.2015.05.023 doi:10.1016/j.enconman.2015.05.023
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 Q Science (General)
QD Chemistry
TJ Mechanical engineering and machinery
spellingShingle Q Science (General)
QD Chemistry
TJ Mechanical engineering and machinery
Yarmand, H.
Gharehkhani, S.
Ahmadi, G.
Shirazi, S.F.S.
Baradaran, S.
Montazer, E.
Zubir, M.N.M.
Alehashem, M.S.
Kazi, S.N.
Dahari, M.
Graphene nanoplatelets–silver hybrid nanofluids for enhanced heat transfer
description In the present experimental work, a new synthesis method is introduced for decoration of silver on the functionalized graphene nanoplatelets (GNP-Ag) and preparation of nanofluids is reported. The thermo-physical properties, heat transfer performance and friction factor for fully developed turbulent flow of GNP-Ag/water nanofluids flowing through a circular tube at a constant heat flux were investigated. GNP-Ag uniform nanocomposite was produced from a simple chemical reaction procedure, which includes acid treatment for functionalization of GNP. The surface characterization was performed by various techniques such as XRD, FESEM, TEM and Raman. The GNP-Ag nanofluids were prepared by dispersing the nanocomposite in distilled water without the assistance of a surfactant and/or ultrasonication. The prepared nanofluids were found to be stable and no sedimentation was observed for a long time. The experimental data for GNP-Ag nanofluids were shown improvements of effective thermal conductivity and heat transfer efficiency in comparison with the corresponding to the base-fluid. The amount of enhancement was a function of temperature and weight concentration of nanoparticles. Maximum enhancement of Nusselt number was 32.7% with a penalty of 1.08 times increase in the friction factor for the weight concentration of 0.1% at a Reynolds number of 17,500 compared to distilled water. Improved empirical correlations were proposed based on the experimental data for evaluation of Nusselt number and friction factor.
format Article
author Yarmand, H.
Gharehkhani, S.
Ahmadi, G.
Shirazi, S.F.S.
Baradaran, S.
Montazer, E.
Zubir, M.N.M.
Alehashem, M.S.
Kazi, S.N.
Dahari, M.
author_facet Yarmand, H.
Gharehkhani, S.
Ahmadi, G.
Shirazi, S.F.S.
Baradaran, S.
Montazer, E.
Zubir, M.N.M.
Alehashem, M.S.
Kazi, S.N.
Dahari, M.
author_sort Yarmand, H.
title Graphene nanoplatelets–silver hybrid nanofluids for enhanced heat transfer
title_short Graphene nanoplatelets–silver hybrid nanofluids for enhanced heat transfer
title_full Graphene nanoplatelets–silver hybrid nanofluids for enhanced heat transfer
title_fullStr Graphene nanoplatelets–silver hybrid nanofluids for enhanced heat transfer
title_full_unstemmed Graphene nanoplatelets–silver hybrid nanofluids for enhanced heat transfer
title_sort graphene nanoplatelets–silver hybrid nanofluids for enhanced heat transfer
publisher Elsevier
publishDate 2015
url http://eprints.um.edu.my/19393/
http://dx.doi.org/10.1016/j.enconman.2015.05.023
_version_ 1643690974675730432
score 13.211869

Similar Items