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Effect of magnetic field on the forced convection heat transfer and pressure drop of a magnetic nanofluid in a miniature heat sink

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Abstract

The effect of an external magnetic field on the forced convection heat transfer and pressure drop of water based Fe3O4 nanofluid (ferrofluid) in a miniature heat sink is studied experimentally. The heat sink with the dimensions of 40 mm (L) × 40 mm (W) × 10 mm (H) consists of an array of five circular channels with diameter and length of 4 and 40 mm, respectively. It is heated from the bottom surface with a constant heat flux while the other surfaces are insulated. The heat sink is also influenced by an external magnetic field generated by an electromagnet. The local convective coefficients are measured at various flow rates (200 < Re < 900), magnetic field intensities (B < 1,400 G), and particle volume fractions (φ = 0.5, 1, 2 and 3 %). Results show that using ferrofluid results in a maximum of 14 % improvement in heat transfer compared to the pure water, in the absence of magnetic field. This value grows up to 38 % when a magnetic field with the strength of 1,200 G is applied to the ferrofluid. On the other hand, it is observed that the significant heat transfer enhancement due to the magnetic field is always accompanied by a pressure drop penalty. The optimum operating condition is obtained based on the maximum heat transfer enhancement per pressure loss.

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Abbreviations

B:

Magnetic flux density (T)

C p :

Specific heat (J/kg K)

D:

Distance between heater block thermocouples

G:

Magnetic flux density unit (Gauss)

H:

Convective heat transfer coefficient (W/m2 k)

H:

Heat sink height (m)

i,j:

Heater block thermocouples

K:

Thermal conductivity of fluid (W/mk)

L:

Heat sink length (m)

Nu:

Nusselt number

P :

Pressure (Pa)

Q:

Total heat power (W)

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

Heat flux based on thermal power (W/m2)

Re :

Raynolds number

T:

Temperature (K)

W:

Heat sink width (m)

μ :

Dynamic viscosity (kg/ms)

ρ:

Density (kg/m3)

φ :

Volume fraction

η :

Efficiency index

Avg:

Average value

I:

Input

F:

Base fluid

M:

Bulk

Nf:

Nanofluid

O:

Output

P:

Particle

Ref:

Reference condition

S:

Surface

References

  1. Choi SUS (1995) Enhancing thermal conductivity of fluids with nanoparticles. In: Siginer DA, Wang HP (eds) Developments and applications of non-Newtonian flows, FED-vol 231/MD-vol 66. ASME, New York, pp 99–105

  2. Wang XQ, Mujumdar AS (2007) Heat transfer characteristics of nanofluids: a review. Int J Therm Sci 46:1–19

    Article  MATH  Google Scholar 

  3. Godson L, Raja B, Mohan Lal D, Wongwises S (2010) Enhancement of heat transfer using nanofluids—an overview. Renew Sustain Energy Rev 14:629–641

    Article  Google Scholar 

  4. Selvakumar P, Suresh S (2012) Convective performance of CuO/water nanofluid in an electronic heat sink. Exp Therm Fluid Sci 40:57–63

    Article  Google Scholar 

  5. Fazeli SA, Hashemi SMH, Zirakzadeh H, Ashjaee M (2012) Experimental and numerical investigation of heat transfer, in a miniature heat sink utilizing silica nanofluid. Superlattices Microstruct 51:247–264

    Article  Google Scholar 

  6. Hashemi SMH, Fazeli SA, Zirakzadeh H, Ashjaee M (2012) Study of heat transfer enhancement in a nanofluid-cooled miniature heat sink. Int Commun Heat Mass Transf 39:877–884

    Article  Google Scholar 

  7. Pantzali MN, Kanaris AG, Antoniadis KD, Mouza AA, Paras SV (2009) Effect of nanofluids on the performance of a miniature plate heat exchanger with modulated surface. Int J Heat Fluid Flow 30:691–699

    Article  Google Scholar 

  8. Pantzali MN, Mouza AA, Paras SV (2009) Investigating the efficacy of nanofluids as coolants in plate heat exchangers (PHE). Chem Eng Sci 64:3290–3300

    Article  Google Scholar 

  9. Zamzamian A, Oskouie SN, Doosthoseini A, Joneidi A, Pazouki M (2011) Experimental investigation of forced convective heat transfer coefficient in nanofluids of Al2O3/EG and CuO/EG in a double pipe and plate heat exchangers under turbulent flow. Exp Therm Fluid Sci 35:495–502

    Article  Google Scholar 

  10. Jwo CS, Jeng LY, Teng TP, Chen C (2010) Performance of overall heat transfer in multi-channel heat exchanger by alumina nanofluid. J Alloy Compd 504S:S385–S388

    Article  Google Scholar 

  11. Rinaldi C, Chaves A, Elborai S, He X, Zahn M (2005) Magnetic fluid rheology and flows. Curr Opin Colloid Interface Sci 10:141–157

    Article  Google Scholar 

  12. Zhu H, Zhang C, Liu S, Tang Y, Yin Y (2006) Effects of nanoparticle clustering and alignment on thermal conductivities of Fe3O4 aqueous nanofluids. Appl Phys Lett 89:023123

    Article  Google Scholar 

  13. Tsai TH, Kuo LS, Chen PH, Yang CT (2009) Thermal conductivity of nanouid with magnetic nanoparticles. PIERS Online 5:154–162

    Article  Google Scholar 

  14. Abareshi M, Goharshadi EK, Zebarjad SM, Fadafan HK, Youssefi A (2010) Fabrication, characterization and measurement of thermal conductivity of Fe3O4 nanofluids. J Magn Magn Mater 322:3895–3901

    Article  Google Scholar 

  15. Lugo L, Legido JL, Piñeiro MM (2011) Enhancement of thermal conductivity and volumetric behavior of FexOy nanofluids M. J. Pastoriza-Gallego. J Appl Phys 110:014309

    Article  Google Scholar 

  16. Philip J, Shima PD, Raj B (2007) Enhancement of thermal conductivity in magnetite based nanofluid due to chainlike structures. Appl Phys 91:203108

    Google Scholar 

  17. Wright B, Thomas D, Hong H, Groven L, Puszynski J, Duke E, Ye X, Jin S (2007) Magnetic field enhanced thermal conductivity in heat transfer nanofluids, containing Ni coated single wall carbon nanotubes. Appl Phys Lett 91:173116

    Article  Google Scholar 

  18. Parekh K, Lee HS (2010) Magnetic field induced enhancement in thermal conductivity of magnetite nanofluid. J Appl Phys 107:09A310

    Google Scholar 

  19. Gavili A, Zabihi F, Isfahani TD, Sabbaghzadeh J (2012) The thermal conductivity of water base ferrofluids under magnetic field. Exp Therm Fluid Sci 41:94–98

    Article  Google Scholar 

  20. Sundar LS, Naik MT, Sharma KV, Singh MK, Reddy TCh (2012) Experimental investigation of forced convection heat transfer and friction factor in a tube with Fe3O4 magnetic nanofluid. Exp Therm Fluid Sci 37:65–71

    Article  Google Scholar 

  21. Motozawaa M, Chang J, Sawada T, Kawaguchi Y (2010) Effect of magnetic field on heat transfer in rectangular duct flow, of a magnetic fluid. Phys Procedia 9:190–1931

    Article  Google Scholar 

  22. Lajvardi M, Moghimi-Rad J, Hadi I, Gavili A, Isfahani TD, Zabihi F, Sabbaghzadeh J (2010) Experimental investigation for enhanced ferrofluid heat transfer under magnetic field effect. J Magn Magn Mater 322:3508–3513

    Article  Google Scholar 

  23. Ghofrani A, Dibaei MH, Hakim Sima A, Shafii MB (2013) Experimental investigation on laminar forced convection heat transfer of ferrofluids under an alternating magnetic field. Exp Therm Fluid Sci 49:193–200

    Article  Google Scholar 

  24. Ahmadi R, Hosseini HR, Masoudi A, Omid H, Zangeneh RN, Ahmadi M, Ahmadi Z, Gu N (2013) Effect of concentration on hydrodynamic size of magnetite-based ferrofluid as a potential MRI contrast agent. Colloids Surf A 424:113–117

    Article  Google Scholar 

  25. Sawada T, Kikura H, Saito A, Tanahashi T (1993) Natural convection of a magnetic fluid in concentric horizontal annuli under nonuniform magnetic fields. Exp Therm Fluid Sci 7:212–220

    Article  Google Scholar 

  26. Li Q, Xuan Y, Wang J (2005) Experimental investigations on transport properties of magnetic fluids. Exp Therm Fluid Sci 30:109–116

    Article  Google Scholar 

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Acknowledgments

The authors wish to acknowledge the financial support (Number 0047) of the National Iranian Gas Company (NIGC) in this research.

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Authors and Affiliations

  1. Department of Mechanical Engineering, University of Tehran, North Kargar Street, Tehran, Iran

    Mehdi Ashjaee & Mohammad Goharkhah

  2. Department of Mechanical and Aerospace Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

    Leila Azizi Khadem & Reza Ahmadi

Authors
  1. Mehdi Ashjaee
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  2. Mohammad Goharkhah
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  3. Leila Azizi Khadem
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  4. Reza Ahmadi
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Correspondence to Mohammad Goharkhah.

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Ashjaee, M., Goharkhah, M., Khadem, L.A. et al. Effect of magnetic field on the forced convection heat transfer and pressure drop of a magnetic nanofluid in a miniature heat sink. Heat Mass Transfer 51, 953–964 (2015). https://doi.org/10.1007/s00231-014-1467-1

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  • DOI: https://doi.org/10.1007/s00231-014-1467-1

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