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Impact of variable fluid properties on forced convection of Fe3O4/CNT/water hybrid nanofluid in a double-pipe mini-channel heat exchanger

  • Amin Shahsavar
  • Ali Godini
  • Pouyan Talebizadeh Sardari
  • Davood ToghraieEmail author
  • Hamzeh Salehipour
Article
  • 37 Downloads

Abstract

The objective of this study is to assess the hydrothermal performance of a non-Newtonian hybrid nanofluid with temperature-dependent thermal conductivity and viscosity compared with a Newtonian hybrid nanofluid with constant thermophysical properties. A counter-current double-pipe mini-channel heat exchanger is studied to analyze the effects of the hybrid nanofluid. The nanofluid is employed as the coolant in the tube side, while the hot water flows in the annulus side. Two different nanoparticles including tetramethylammonium hydroxide-coated Fe3O4 (magnetite) nanoparticles and gum arabic-coated carbon nanotubes are used to prepare the water-based hybrid nanofluid. The results demonstrated that the non-Newtonian hybrid nanofluid always has a higher heat transfer rate, overall heat transfer coefficient, and effectiveness than those of the Newtonian hybrid nanofluid, while the opposite is true for the pressure drop, pumping power, and performance evaluation criterion. Supposing that the Fe3O4-carbon nanotube/water hybrid nanofluid is a Newtonian fluid with constant thermal conductivity and viscosity, there leads to large error in the computation of pressure drop (1.5–9.71%), pumping power (1.5–9.71%), and performance evaluation criterion (18.24–19.60%), whereas the errors in the computation of heat transfer rate, overall heat transfer coefficient, and effectiveness are not considerable (less than 2.91%).

Keywords

Non-Newtonian hybrid nanofluid Double-pipe heat exchanger Magnetite Carbon nanotube Convective heat transfer 

List of symbols

A

Internal tube surface area (m2)

Cmin

Minimum heat capacity rate (W K−1)

cp

Specific heat capacity (J kg−1 K−1)

Dh

Hydraulic diameter (m)

f

Friction factor

h

Convective heat transfer coefficient (W m−2 K−1)

k

Thermal conductivity (W m−1 K−1)

L

Length (m)

\(\dot{m}\)

Mass flow rate (kg s−1)

Nu

Nusselt number

PEC

Performance evaluation criterion

p

Pressure (Pa)

\(\dot{Q}\)

Heat transfer rate (W)

Re

Reynolds number

ri

Inlet radius (m)

ro

Outlet radius (m)

T

Temperature (K)

ΔTLMTD

Logarithmic mean temperature difference (K)

U

Overall heat transfer coefficient (W m−2 K−1)

uin

Inlet velocity (m s−1)

V

Velocity (m s−1)

\(\dot{V}\)

Volumetric flow rate (m3 s−1)

\(\dot{W}\)

Pumping power (W)

Greek symbols

ε

Heat exchanger effectiveness

μ

Dynamic viscosity (Pa s)

ρ

Density (kg m−3)

φ

Volume concentration of nanoparticles (%)

Subscripts

CNT

Carbon nanotube

i

Inlet

M

Magnetite

N

Newtonian

NN

Non-Newtonian

nf

Nanofluid

o

Outlet

s

Wall

w

Water

Notes

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Amin Shahsavar
    • 1
  • Ali Godini
    • 1
  • Pouyan Talebizadeh Sardari
    • 2
  • Davood Toghraie
    • 3
    Email author
  • Hamzeh Salehipour
    • 4
  1. 1.Department of Mechanical EngineeringKermanshah University of TechnologyKermanshahIran
  2. 2.Fluids and Thermal Engineering Research Group, Faculty of EngineeringThe University of NottinghamNottinghamUK
  3. 3.Department of Mechanical EngineeringKhomeinishahr Branch, Islamic Azad UniversityIsfahanIran
  4. 4.Department of Mechanical EngineeringIlam UniversityIlamIran

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