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Experimental study on convective heat transfer of TiO2 nanofluids

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Abstract

In this study, nanofluids with different TiO2 nanoparticle concentrations were synthesized and measured in different constant heat fluxes for their heat transfer behavior upon flowing through a vertical pipe. Addition of nanoparticles into the base fluid enhances the forced convective heat transfer coefficient. The results show that the enhancement of the convective heat transfer coefficient in the mixture consisting of ethylene glycol and distilled water is more than distilled water as a base fluid.

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Abbreviations

c:

Heat capacity (kJ kg−1 °C−1)

D:

Inner diameter (m)

h:

Convective heat transfer coefficient (W m−2 °C−1)

k:

Thermal conductivity (W m−1 °C−1)

q:

Heat flux (W m−2)

Q:

Flow rate (m3 s−1)

S:

Perimeter of the tube (m)

T:

Temperature (°C)

u:

Fluid velocity (m s−1)

x:

Axial position (m)

α:

Thermal diffusivity (m2 s−1)

ρ :

Density (kg m−3)

μ :

Viscosity (kg m−1 s−1)

υ :

Fluid kinematic viscosity (m2 s−1)

φ :

Particle volume fraction

ψ :

Sphericity

f:

Fluid

w:

Wall of the test section

in:

Inlet of the test section

nf:

Nanofluid

p:

Solid phase

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Authors and Affiliations

  1. Department of Chemical Engineering, College of Engineering, Shahid Bahonar University of Kerman, P.O. Box 76175-133, Kerman, Iran

    M. Vakili, A. Mohebbi & H. Hashemipour

Authors
  1. M. Vakili
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  2. A. Mohebbi
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  3. H. Hashemipour
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Corresponding author

Correspondence to A. Mohebbi.

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Vakili, M., Mohebbi, A. & Hashemipour, H. Experimental study on convective heat transfer of TiO2 nanofluids. Heat Mass Transfer 49, 1159–1165 (2013). https://doi.org/10.1007/s00231-013-1158-3

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  • DOI: https://doi.org/10.1007/s00231-013-1158-3

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