Journal of Thermal Analysis and Calorimetry

, Volume 129, Issue 2, pp 947–955 | Cite as

Thermal conductivity and specific heat capacity of water–ethylene glycol mixture-based nanofluids with graphene nanoplatelets

Article

Abstract

In the present work, we report the thermal conductivity and specific heat capacity of water–ethylene glycol mixture with graphene nanoplatelets inclusions. Stable nanofluid dispersions were prepared with sodium deoxycholate as the surfactant. Stability of nanofluids was characterized by optical absorption spectroscopy and zeta potential analysis. Thermal conductivity of nanofluids was found to increase with respect to nanoplatelets loading, while the specific heat capacity was decreasing. Highest enhancement in thermal conductivity of nanofluid was found to be ~18% at 0.45 vol% of nanoplatelets loading while at the same concentration the specific heat capacity was ~8% lower. Further measured thermal conductivity was compared with effective medium theory calculations considering the role of interfacial thermal resistance. From the model calculations, we show that the interfacial thermal resistance between graphene nanoplatelets and water–ethylene glycol mixture was significantly high in the order of 1.7 × 10−8 m2 K W−1 which limits the thermal conductivity enhancement despite the high intrinsic thermal conductivity of graphene nanoplatelets.

Keywords

Thermal conductivity Specific heat capacity Graphene nanoplatelets Nanofluid 

Abbreviations

GnP

Graphene nanoplatelets

GnP/H2O–EG

Graphene/water–ethylene glycol nanofluid

EG

Ethylene glycol

H2O

Water

SDC

Sodium deoxycholate

SWCNT

Single-walled carbon nanotubes

vol%

Volume fraction of the nanomaterial

mass%

Weight fraction of the nanomaterial

List of symbols

Cp

Specific heat capacity (kJ kg−1 K−1)

k

Thermal conductivity (W m−1 K−1)

Greek symbols

ρ

Density (g cm−3)

φ

Volume fraction (%)

Subscripts

bf

Basefluid

nf

Nanofluid

P

Nanoparticle

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2017

Authors and Affiliations

  1. 1.Refrigeration and Air-Conditioning Division, Department of Mechanical EngineeringAnna UniversityChennaiIndia
  2. 2.International Institute for Carbon-Neutral Energy Research Kyushu University (WPI-I2CNER)FukuokaJapan

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