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Experimental study of the subcooled flow boiling heat transfer of magnetic nanofluid in a vertical tube under magnetic field

  • Sajjad Ahangar ZonouziEmail author
  • Rahmatollah Khodabandeh
  • Habibollah Safarzadeh
  • Habib AminfarEmail author
  • Mousa Mohammadpourfard
  • Morteza Ghanbarpour
Article
  • 29 Downloads

Abstract

In this study, the subcooled boiling heat transfer of a Fe3O4/water magnetic nanofluid flowing through a vertical tube has been investigated experimentally in the presence and absence of a magnetic field. The magnetic field has been generated by quadrupole magnets. The subcooled boiling heat transfer coefficient and the boiling curves of the ferrofluid flow under the action of the magnetic field have been compared with those in the absence of magnetic field. The results showed that magnetic actuation contributes to have higher heat fluxes at the same wall superheat in comparison with heat fluxes achieved in the no magnetic field case. Therefore, the local subcooled boiling heat transfer coefficients are increased by the magnetic field. The maximum measured enhancement in local subcooled boiling heat transfer coefficient along the length of the tube by applying magnetic field is 46.58% at applied heat flux of 77,000 W m−2 and mass flux of 270 kg m−2 s−1. Furthermore, the enhancement of local heat transfer coefficient by applying magnetic field decreases as the applied heat flux in the subcooled boiling region is increased.

Keywords

Subcooled flow boiling Magnetic nanofluid Quadrupole magnetic field Experimental study 

List of symbols

cp

Specific heat capacity (J kg−1 K−1)

d

Tube diameter (m)

G

Mass flux (kg m−2 s−1)

h

Heat transfer coefficient (Wm−2 K−1)

I

Amperage

K

Thermal conductivity (Wm−1 K−1)

L

Length (m)

\(\dot{m}\)

Mass flow rate (kg s−1)

Nu

Nusselt number, hd/k

Pr

Prandtl number, \(\frac{{\mu c_{\text{p}} }}{k}\)

Re

Reynolds number, \(\frac{{4\dot{m}}}{\pi d\mu }\)

ΔP

Pressure drop (Pa)

\(\ddot{q}\)

Heat flux (W m−2)

T

Temperature (°C)

V

Voltage

z

Axial distance (m)

u

Velocity (m s−1)

Greek symbols

ρ

Density (kg m−3)

μ

Dynamic viscosity (Pa s)

Subscripts

i

Inner

o

Outer

w

Wall

z

Axial direction

Notes

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Copyright information

© Akadémiai Kiadó, Budapest, Hungary 2019

Authors and Affiliations

  • Sajjad Ahangar Zonouzi
    • 1
    Email author
  • Rahmatollah Khodabandeh
    • 2
  • Habibollah Safarzadeh
    • 3
  • Habib Aminfar
    • 1
    Email author
  • Mousa Mohammadpourfard
    • 4
  • Morteza Ghanbarpour
    • 2
  1. 1.Faculty of Mechanical EngineeringUniversity of TabrizTabrizIran
  2. 2.Department of Energy TechnologyRoyal Institute of Technology (KTH)StockholmSweden
  3. 3.Department of Mechanical EngineeringRazi UniversityKermanshahIran
  4. 4.Faculty of Chemical and Petroleum EngineeringUniversity of TabrizTabrizIran

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