Experimental investigation of the hydrothermal aspects of water–Fe3O4 nanofluid inside a twisted tube

Abstract

The impetus of this experimental investigation is to analyze the laminar forced convection of water-based nanofluid (NF) including Fe3O4 nanoparticles inside a twisted tube. The impacts of NF concentration (0% < \( \varphi \) < 2%), Reynolds number (500 < \( {\text{Re}} \) < 2000) and twist pitch (10–100 mm) on the average Nusselt number (\( \overline{\text{Nu}} \)), friction factor, and overall hydrothermal performance indicator are assessed, and the results are compared with those of the plain tube. It was found that the \( \overline{\text{Nu}} \) of NF rises with boosting \( \varphi \) and \( {\text{Re}} \), while it declines with boosting twist pitch. In addition, it was found that the rise of \( \varphi \) causes a rise in the friction factor, while it diminishes with the rise of \( {\text{Re}} \) and twist pitch. Moreover, the results depicted that the overall hydrothermal performance of NF in the twisted tube is superior to that of the water in the plain tube. The best overall hydrothermal performance of the NF occurred at \( \varphi \) = 2%, \( {\text{Re}} \) = 2000 and twist pitch = 10 mm.

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Abbreviations

A :

Heat transfer surface area (m2)

\( c_{\text{p}} \) :

Specific heat capacity (J kg−1 K−1)

\( D_{\text{h}} \) :

Hydraulic diameter (m)

f :

Friction factor (–)

h :

Convection coefficient (W m−2 K−1)

k :

Conduction coefficient (W m−1 K−1)

L :

Tube length (m)

\( \dot{m} \) :

Mass flow rate (kg s−1)

Nu:

Nusselt number (–)

Pr:

Prandtl number (–)

\( \Delta p \) :

Pressure drop (Pa)

Q :

Convection heat transfer rate (W)

Re:

Reynolds number (–)

\( T_{\text{b}} \) :

Average bulk fluid temperature (°C)

\( T_{\text{in}} \) :

Inlet temperature (°C)

\( T_{\text{out}} \) :

Outlet temperature (°C)

\( T_{\text{w}} \) :

Average wall temperature (°C)

V :

Velocity (m s−1)

\( \rho \) :

Density (kg m−3)

\( \varphi \) :

Volume concentration (%)

\( \mu \) :

Viscosity (kg m−1 s−1)

\( \eta \) :

Performance indicator (–)

nf:

Nanofluid

p:

Particle

pt:

Plain tube

tt:

Twisted tube

w:

Water

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Correspondence to Masoud Afrand.

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Niknejadi, M., Afrand, M., Karimipour, A. et al. Experimental investigation of the hydrothermal aspects of water–Fe3O4 nanofluid inside a twisted tube. J Therm Anal Calorim 143, 801–810 (2021). https://doi.org/10.1007/s10973-020-09271-0

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Keywords

  • Convective heat transfer
  • Friction factor
  • Nusselt number
  • Pressure drop
  • Twisted tube
  • Water–Fe3O4 nanofluid