Heat Transfer Performance of Functionalized Graphene Nanoplatelet Aqueous Nanofluids

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 su...

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Bibliographic Details
Published in:Materials 2016-06, Vol.9 (6), p.455
Main Authors: Agromayor, Roberto, Cabaleiro, David, Pardinas, Angel A, Vallejo, Javier P, Fernandez-Seara, Jose, Lugo, Luis
Format: Article
Language:English
Subjects:
20th century
Carbon
Conductivity
Graphene
Heat conductivity
Heat transfer
Nanoparticles
Sedimentation & deposition
Viscosity
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Summary: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.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma9060455