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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
Bernard Bahaya

Civil and Environmental Engineering, University of Texas-San Antonio, One UTSA Circle, San Antonio, TX 78249
bernardbahaya@gmail.com

Drew Johnson

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

C. C. Yavuzturk

Mechanical Engineering, University of Hartford, 200 Bloomfield Ave., West Hartford, CT 06117
yavuzturk@hartford.edu

1Corresponding author.

ASME doi:10.1115/1.4038835 History: Received February 07, 2017; Revised November 17, 2017

Abstract

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 media (DEM) model of Chu, Li [1] is shown to describe the experimental results of this study when using a fitted interfacial resistance value of 6E -8 m2 K W-1. The viscosity model of Einstein [2] provided close agreement between measured and predicted values when the effects of temperature where included and the intrinsic viscosity model term was adjusted to a value representative for GNP. Heat transfer in external flows in laminar regime is predicted to decrease for GNP nanofluids when compared to water alone.

Copyright (c) 2017 by ASME
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