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Transport in Porous Media

, Volume 116, Issue 2, pp 959–974 | Cite as

The Experimental Study of Convection Heat Transfer Characteristics and Pressure Drop of Magnetite Nanofluid in a Porous Metal Foam Tube

  • Mohammad Amani
  • Mohammad Ameri
  • Alibakhsh KasaeianEmail author
Article

Abstract

In the present study, the laminar forced convection heat transfer improvement and pressure loss of magnetite \(\hbox {Fe}_{3}\hbox {O}_{4}\)/water nanofluid flowing through a porous metal foam tube have been studied experimentally. To reach this goal, the magnetite \(\hbox {Fe}_{3}\hbox {O}_{4}\) nanoparticles with 30 nm diameter are synthesized. The investigation of the effect of nanoparticle weight fraction and Reynolds number on the convection heat transfer and pressure drop characteristics are two objectives of this work. The experimental observations reveal that the increment of nanoparticle weight fraction and Reynolds number improves the Nusselt number. Furthermore, the Nusselt number enhancement is more pronounced for the high Reynolds numbers due to the addition of nanoparticles. By dispersing 1% weight fraction of magnetite nanoparticles inside DI-water, 7.4 and 11.7% heat transfer enhancements are achieved at \(Re = 200\) and 1000, respectively. A slight increase in magnetite \(\hbox {Fe}_{3}\hbox {O}_{4}\) nanofluid pressure drop is observed rather than that of DI-water due to the increment of nanofluid viscosity by nanoparticle dispersion inside the water. A performance index is proposed to consider the effects of Nusselt number enhancement and pressure drop simultaneously. It is shown that the performance index is higher than unity at all conditions in this study. Therefore, the convection heat transfer improvement dominates the pressure loss. A novel correlation is derived and presented based on the experiments to predict the Nusselt number.

Keywords

Magnetite Nanofluid Metal foam Forced convection Porous media 

List of Symbols

D

Diameter (m)

L

Tube length (m)

x

Axial distance from the tube entrance (m)

\({q}^{\prime \prime }\)

Heat flux (w/m\(^{2}\))

Q

Heat transfer rate (W)

\(\dot{m}\)

Mass flow rate (kg/s)

P

Pressure (kPa)

v

Velocity (m/s)

T

Temperature (\({^{\circ }}\)C)

k

Thermal conductivity (W/m K)

\(C_\mathrm{p}\)

Specific heat (J/kg K)

h

Convective heat transfer coefficient (W/m\(^{2}\) K)

V

Voltage (V)

I

Current (A)

f

Friction factor

PPI

Pore per inch

Re

Reynolds number

Pr

Prandtl number

Nu

Nusselt number

Greek Letters

\(\varphi \)

Nanoparticle fraction (%)

\(\rho \)

Density (kg/m\(^{3}\))

\(\mu \)

Dynamic viscosity (pa.s)

\(\varepsilon \)

Porosity

\(\eta \)

Performance index

Subscripts

m

Bulk of fluid

s

Surface, solid

nf

Nanofluid

f

Base fluid

p

Particle

w

Water

eff

Effective

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  • Mohammad Amani
    • 1
  • Mohammad Ameri
    • 1
  • Alibakhsh Kasaeian
    • 2
    Email author
  1. 1.Department of Mechanical and Energy EngineeringShahid Beheshti UniversityTehranIran
  2. 2.Department of Renewable Energies, Faculty of New Science and TechnologiesUniversity of TehranTehranIran

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