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Journal of Nanoparticle Research

, Volume 12, Issue 7, pp 2611–2619 | Cite as

Heat transfer enhancement by application of nano-powder

  • M. T. Hamed Mosavian
  • S. Zeinali Heris
  • S. Gh. Etemad
  • M. Nasr Esfahany
Research Paper

Abstract

In this investigation, laminar flow heat transfer enhancement in circular tube utilizing different nanofluids including Al2O3 (20 nm), CuO (50 nm), and Cu (25 nm) nanoparticles in water was studied. Constant wall temperature was used as thermal boundary condition. The results indicate enhancement of heat transfer with increasing nanoparticle concentrations, but an optimum concentration for each nanofluid suspension can be found. Based on the experimental results, metallic nanoparticles show better enhancement of heat transfer coefficient in comparison with oxide particles. The promotions of heat transfer due to utilizing nanoparticles are higher than the theoretical correlation prediction.

Keywords

Laminar flow Nanofluid Colloids Heat transfer enhancement Metallic nanoparticle Oxide nanoparticle Forced convection 

List of symbols

A

Tube cross-sectional area (m2)

Cpnf

Nanofluid specific heat (kJ kg−1 K−1)

Cps

Specific heat of nanoparticle (kJ kg−1 K−1)

CpW

Specific heat of water (kJ kg−1 K−1)

D

Tube diameter (m)

\( \overline{{h_{\text{nf}} }} (\exp ) \)

Nanofluid experimental average heat transfer coefficient (Wm−2 K−1)

knf

Nanofluid thermal conductivity (Wm−1 K−1)

ks

Thermal conductivity of nanoparticle (Wm−1 K−1)

kW

Thermal conductivity of water (Wm−1 K−1)

L

Tube length (m)

ms

Nanoparticle mass in nanofluid suspension (kg)

\( \overline{{Nu_{\text{nf}} }} (\exp ) \)

Nanofluid experimental average Nusselt number

\( \overline{{Nu_{\text{nf}} }} (th) \)

Nanofluid Nusselt number calculated form Seider–Tate equation

Penf

Nanofluid Peclet number

Prnf

Nanofluid Prandtl number

Renf

Nanofluid Reynolds number

Tb1

Inlet bulk temperature (K)

Tb2

Exit bulk temperature (K)

\( \overline{Tb} \)

Average bulk temperature (K)

Tw

Tube wall temperature (K)

\( \overline{U} \)

Average fluid velocity (m s−1)

Vs

Nanoparticle volume in nanofluid suspension (m3)

Vt

Total volume of nanofluid (m3)

Greek letters

μnf

Nanofluid viscosity (Pa)

μW

Water viscosity (Pa)

μWnf

Nanofluid viscosity at tube wall temperature (Pa)

ν

Nanoparticle volume fraction

ρnf

Nanofluid density (kg m−3)

ρs

Nanoparticle density (kg m−3)

ρW

Water density (kg m−3)

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  • M. T. Hamed Mosavian
    • 1
  • S. Zeinali Heris
    • 1
  • S. Gh. Etemad
    • 2
  • M. Nasr Esfahany
    • 2
  1. 1.Department of Chemical Engineering, Faculty of EngineeringFerdowsi University of MashhadMashhadIran
  2. 2.Department of Chemical EngineeringIsfahan University of TechnologyIsfahanIran

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