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A new turbine model for enhancing convective heat transfer in the presence of low volume concentration of Ag-Oil Nanofluids

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Abstract

This study aims to experimentally investigate and introduce a new model for enhancing convective heat transfer in the presence of Ag/ oil nanofluid. An annular tube was designed with a turbine element attached to the inner tube. The inner tube was a bearing shaft which could rotate with the rotation of turbine element. As the previous works by authors, the setup was conducted with a fully developed laminar flow regime with the Reynolds numbers less than 160. The outer surface of the annular tube was heated by an element with constant heat flux of 204 W. Ag/ oil nanofluid was used in different volume concentrations of 0.011%, 0.044% and 0.171%. The new model could enhance the convective heat transfer coefficient up to 54% (compared to the simple annular tube in the case of base fluid) for the best studied case (nanofluid with the volume concentration of 0.171%) while the friction factor remained low. The new model can be applied for related applications regarding Ag/ oil nanofluid as a new step in enhancing the convective heat transfer coefficient.

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Abbreviations

k:

Thermal conductivity (W/m K)

Cp :

Specific heat (J/kg K)

h:

Convective heat transfer coefficient (W/m2 K)

Nu:

Nusselt number

Re:

Reynolds number

μ:

Dynamic viscosity (Pa.s)

D:

Diameter (m)

Ts :

Surface temperature (K)

Δp:

Pressure drop (Pa.s)

Tmo :

Outlet mean temperature (K)

dt :

Thermal boundary layer thickness

ρ:

Density (kg/m3)

υ:

Kinematic Viscosity (cSt)

nf :

Nanofluid

f :

Basefluid

Tm :

Mean temperature (K)

Dh :

Hydraulic diameter (m)

P:

Tube perimeter (m)

x:

Length (m)

Pr:

Prandtl number

Tmi :

Inlet mean temperature (K)

φ:

Volume concentration

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Authors and Affiliations

  1. Aerospace Engineering Department, K. N. Toosi University of Technology, Tehran, Iran

    Amin Jafarimoghaddam

  2. Tehran, Iran

    Sadegh Aberoumand

  3. Department of Mechanical Engineering, Islamic Azad University, Dezful Branch, Dezful, Iran

    Reza Jafarimoghaddam

Authors
  1. Amin Jafarimoghaddam
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  2. Sadegh Aberoumand
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  3. Reza Jafarimoghaddam
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Correspondence to Amin Jafarimoghaddam.

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Jafarimoghaddam, A., Aberoumand, S. & Jafarimoghaddam, R. A new turbine model for enhancing convective heat transfer in the presence of low volume concentration of Ag-Oil Nanofluids. Heat Mass Transfer 54, 1491–1501 (2018). https://doi.org/10.1007/s00231-017-2243-9

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  • DOI: https://doi.org/10.1007/s00231-017-2243-9

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