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Materials 2016, 9(6), 455; doi:10.3390/ma9060455

Heat Transfer Performance of Functionalized Graphene Nanoplatelet Aqueous Nanofluids

1
Área de Máquinas y Motores Térmicos, Escola de Enxeñería Industrial, Universidade de Vigo, Vigo E-36310, Spain
2
Departamento de Física Aplicada, Facultade de Ciencias, Universidade de Vigo, Vigo E-36310, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Deepak Pant
Received: 29 April 2016 / Revised: 25 May 2016 / Accepted: 31 May 2016 / Published: 8 June 2016
(This article belongs to the Special Issue Advances in Renewable Energy Conversion Materials)
View Full-Text   |   Download PDF [2357 KB, uploaded 8 June 2016]   |  

Abstract

The low thermal conductivity of fluids used in many industrial applications is one of the primary limitations in the development of more efficient heat transfer systems. A promising solution to this problem is the suspension of nanoparticles with high thermal conductivities in a base fluid. These suspensions, known as nanofluids, have great potential for enhancing heat transfer. The heat transfer enhancement of sulfonic acid-functionalized graphene nanoplatelet water-based nanofluids is addressed in this work. A new experimental setup was designed for this purpose. Convection coefficients, pressure drops, and thermophysical properties of various nanofluids at different concentrations were measured for several operational conditions and the results are compared with those of pure water. Enhancements in thermal conductivity and in convection heat transfer coefficient reach 12% (1 wt %) and 32% (0.5 wt %), respectively. New correlations capable of predicting the Nusselt number and the friction factor of this kind of nanofluid as a function of other dimensionless quantities are developed. In addition, thermal performance factors are obtained from the experimental convection coefficient and pressure drop data in order to assess the convenience of replacing the base fluid with designed nanofluids. View Full-Text
Keywords: heat transfer coefficient; nanofluid; graphene nanoplatelets; pressure drop heat transfer coefficient; nanofluid; graphene nanoplatelets; pressure drop
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Agromayor, R.; Cabaleiro, D.; Pardinas, A.A.; Vallejo, J.P.; Fernandez-Seara, J.; Lugo, L. Heat Transfer Performance of Functionalized Graphene Nanoplatelet Aqueous Nanofluids. Materials 2016, 9, 455.

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