Graphene nanoplatelets–silver hybrid nanofluids for enhanced heat transfer

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

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Official URL: http://dx.doi.org/10.1016/j.enconman.2015.05.023

Abstract

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.

Item Type: Article
Uncontrolled Keywords: GNP–Ag nanocomposite; Hybrid nanofluid; Nusselt number; Friction factor; Turbulent flow
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
T Technology > TJ Mechanical engineering and machinery
Divisions: Faculty of Engineering
Faculty of Science > Dept of Chemistry
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 25 Sep 2018 02:58
Last Modified: 25 Sep 2018 02:58
URI: http://eprints.um.edu.my/id/eprint/19393

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