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Thermophysical properties and heat transfer performance of carbon nanotubes water-based nanofluids

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Abstract

In this paper, thermal conductivity and rheological properties of CNT water-based nanofluids were experimentally measured, whereas density and heat capacity were evaluated from appropriate theoretical correlations. The influence of nanoparticle content and base fluids on thermophysical properties of nanofluids was presented and discussed. Then, the thermal performance and convective heat transfer of such nanofluids were investigated in a coaxial heat exchanger working in co-current flow. Fixed wall temperature boundary condition and laminar regime were also considered during the experiments. The results were presented discussing the effect of the entrance region, Reynolds number and nanofluids composition.

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Abbreviations

ϕ :

Concentration (%)

λ :

Thermal conductivity (W m−1 K−1)

h :

Convective heat coefficient (W m−2 K)

C p :

Specific heat (J kg−1 K−1)

ρ :

Density (kg m−3)

Nu :

Nusselt number

Re :

Reynolds number

T :

Temperature (°C)

x :

Axial distance (m)

e :

Thickness (m)

D :

Inner diameter of the tube (m)

m :

Mass flow rate (kg s−1)

W:

Water

EG:

Ethylene glycol

N2:

Nanofluids with water as base fluid

N6:

Nanofluids with EG + water as base fluid

wt:

Weight fraction

bf:

Base fluid

np:

Nanoparticle

nf:

Nanofluid

th:

Thermocouple

a:

Annular tube

s:

Stainless steel

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Authors and Affiliations

  1. LGCGM, Matériaux et Thermo-Rhéologie, Université Rennes 1, Rennes, France

    Patrice Estellé

  2. Cellule Recherche et développement, Polymont Engineering, Paris, France

    Salma Halelfadl

  3. LGCGM, Matériaux et Thermo-Rhéologie, Université Rennes 1, Saint-Malo, France

    Thierry Maré

Authors
  1. Patrice Estellé
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  2. Salma Halelfadl
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  3. Thierry Maré
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Correspondence to Patrice Estellé.

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Estellé, P., Halelfadl, S. & Maré, T. Thermophysical properties and heat transfer performance of carbon nanotubes water-based nanofluids. J Therm Anal Calorim 127, 2075–2081 (2017). https://doi.org/10.1007/s10973-016-5833-8

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  • DOI: https://doi.org/10.1007/s10973-016-5833-8

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