Silver–water nanofluid flow and convective heat transfer in a microfin tube equipped with loose-fit twisted tapes

  • P. Samruaisin
  • K. Wongcharee
  • V. ChuwattanakulEmail author
  • S. Eiamsa-ard


Heat transfer enhancement and performance of compact heat exchangers have been extensively studied in the past century for the purpose of promoting energy efficiency. Microfin tubes in single/two/multiple-phase flow heat exchangers into which twisted tape swirl generators are installed can promote heat transfer with a moderate pressure loss penalty. This article reports on the enhanced heat transfer of silver–water nanofluids in a microfin tube into which loose-fit twisted tapes are installed in a counter-flow arrangement. The experiments were carried out using nanofluids with various silver concentrations (0.007–0.03 vol%), loose-fit twisted tapes with clearance ratios (c/D) of 0.0 (tight-fit), 0.05, 0.075 and 0.1, for a twist ratio, y/W, of 2.0. The results indicate that the heat transfer rate (Nu) and pressure drop (f) increase with a decrease in clearance ratio (c/D) and increase in silver (Ag) nanoparticle concentration. Additionally, the thermal performance factor tends to increase with the decrease in Reynolds numbers.


Heat transfer Friction factor Thermal performance Microfin tube Loose-fit twisted tapes Silver–water nanofluids 

List of symbols


Heat transfer surface area (m2)


Specific heat capacity of water (J kg−1 K−1)


Specific heat capacity of silver nanoparticle (J kg−1 K−1)


Clearance between the edge of fin and tape (m)


Hydraulic diameter of the microfin tube (m)


Friction factor


Heat transfer coefficient (W m−2 K−1)


Thermal conductivity of water (W m−1 K−1)


Thermal conductivity of silver–water nanofluid (W m−1 K−1)


Thermal conductivity of silver nanoparticle (W m−1 K−1)


Length of the test tube (m)


Mass flow rate (kg s−1)


Nusselt number


Pressure of flow (Pa)


Pressure drop (Pa)


Prandtl number


Heat transfer rate (W)


Reynolds number


Temperature (K)


Mean temperature (K)


Mean axial flow velocity (m s−1)


Twisted tape width (m)


Twist length (m)

Greek symbols


Silver–water nanofluid concentration (% by volume)


Fluid density (kg m−3)


Twisted tape thickness (m)


Fluid dynamic viscosity (kg s−1 m−1)


Thermal performance factor











Not enhanced









Microfin tube fitted with twisted tape in counter arrangement


Microfin tube



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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • P. Samruaisin
    • 1
  • K. Wongcharee
    • 2
  • V. Chuwattanakul
    • 3
    Email author
  • S. Eiamsa-ard
    • 1
  1. 1.Department of Mechanical Engineering, Faculty of EngineeringMahanakorn University of TechnologyBangkokThailand
  2. 2.Department of Chemical Engineering, Faculty of EngineeringMahanakorn University of TechnologyBangkokThailand
  3. 3.Faculty of EngineeringKing Mongkut’s Institute of Technology LadkrabangBangkokThailand

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