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Heat and Mass Transfer

, Volume 54, Issue 5, pp 1491–1501 | Cite as

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

  • Amin Jafarimoghaddam
  • Sadegh Aberoumand
  • Reza Jafarimoghaddam
Original

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.

Nomenclatures

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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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2017

Authors and Affiliations

  • Amin Jafarimoghaddam
    • 1
  • Sadegh Aberoumand
    • 2
  • Reza Jafarimoghaddam
    • 3
  1. 1.Aerospace Engineering DepartmentK. N. Toosi University of TechnologyTehranIran
  2. 2.TehranIran
  3. 3.Department of Mechanical EngineeringIslamic Azad UniversityDezfulIran

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