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Technical Brief

On the Effect of Graphene Nanoplatelets on Water–Graphene Nanofluid Thermal Conductivity, Viscosity, and Heat Transfer Under Laminar External Flow Conditions

[+] Author and Article Information
B. Bahaya

Civil and Environmental Engineering,
University of Texas-San Antonio,
One UTSA Circle,
San Antonio, TX 78249

D. W. Johnson

Civil and Environmental Engineering,
University of Texas-San Antonio,
One UTSA Circle,
San Antonio, TX 78249
e-mail: drew.johnson@utsa.edu

C. C. Yavuzturk

Mechanical Engineering,
University of Hartford,
200 Bloomfield Avenue,
West Hartford, CT 06117

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received February 7, 2017; final manuscript received November 17, 2017; published online March 9, 2018. Editor: Portonovo S. Ayyaswamy.

J. Heat Transfer 140(6), 064501 (Mar 09, 2018) (4 pages) Paper No: HT-17-1069; doi: 10.1115/1.4038835 History: Received February 07, 2017; Revised November 17, 2017

Experiments were conducted with graphene nanoplatelets (GNP) to investigate the relative benefit of the thermal conductivity increase in relationship to the potential detriment of increased viscosity. The maximum enhancement ratio for GNP nanofluid thermal conductivity over water was determined to be 1.43 at a volume fraction of 0.014. Based on GNP aspect ratios, the differential effective medium model is shown to describe the experimental results of this study when using a fitted interfacial resistance value of 6 × 10−8 m2 K W−1. The viscosity model of Einstein provided close agreement between measured and predicted values when the effects of temperature were included and the intrinsic viscosity model term was adjusted to a value of 2151 representative for GNP. Heat transfer in external flows in laminar regime is predicted to decrease for GNP nanofluids when compared to water alone.

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References

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Figures

Grahic Jump Location
Fig. 1

Relative thermal conductivity for differing GNP volume faction

Grahic Jump Location
Fig. 2

Experimental thermal conductivity enhancement compared with the thermal conductivity enhancement predicted from the differential effective medium model presented by Chu et al. [1] for different Rk

Grahic Jump Location
Fig. 3

Experimental relative viscosity compared to those predicted by Eqs. (3) and (14) for differing temperatures and GNP volume fraction

Grahic Jump Location
Fig. 4

Predicted heat transfer through a nanofluid with GNP volumetric fraction

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