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Research Papers: Porous Media

Convective Heat Transfer of Al2O3 Nanofluids in Porous Media

[+] Author and Article Information
Navid O. Ghaziani

Department of Mechanical Engineering,
University of Texas at Dallas,
Richardson, TX 75080
e-mail: nav.omidvar@gmail.com

Fatemeh Hassanipour

Department of Mechanical Engineering,
University of Texas at Dallas,
Richardson, TX 75080
e-mail: fatemeh@utdallas.edu

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received May 9, 2015; final manuscript received October 5, 2016; published online December 7, 2016. Assoc. Editor: Oronzio Manca.

J. Heat Transfer 139(3), 032601 (Dec 07, 2016) (7 pages) Paper No: HT-15-1332; doi: 10.1115/1.4034936 History: Received May 09, 2015; Revised October 05, 2016

In this study, the performance of a heat sink embedded with a porous medium and nanofluids as coolants is analyzed experimentally. The nanofluid is a mixture of de-ionized water and nanoscale Al2O3 particles with three different volumetric concentrations: ζ = 0.41%, 0.58%, and 0.83%. The experimental test section is a rectangular minichannel filled with metal foam, which is electrically heated to provide a constant heat flux. The porous medium is assumed to be homogeneous and the flow regime is laminar. The result of heat transfer enhancement by slurry of Al2O3 nanofluid in porous media is studied under various flow velocities, heat flux, porous media structure, and particle concentration of nanofluid. The effect of particles volume fraction on heat transfer coefficient is also studied. This experimental study discovers and/or confirms the following hypotheses: (1) nanoparticle slurry in conjunction with metal foam has a significant effect on heat transfer rate; (2) there is an optimum permeability for the foam resulting in maximal heat transfer rate; (3) for a fixed particle concentration, smaller particles are more effective in enhancing heat transfer; and (4) increasing particle concentration results in some gains, but this trend weakens after a threshold.

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Figures

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Fig. 1

(a) γAl2O3 nanoparticles (particles are completely aggregated) and (b) suspension of γAl2O3 after 12 h

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Fig. 2

Schematic diagram of the experimental system

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Fig. 3

Schematic configuration of (a) top view and side view of the test module and (b) heaters and thermocouples distribution under the test section, dimensions are in mm

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Fig. 4

Aluminum porous media used in the experiments: (a) PPI = 10, (b) PPI = 20, and (c) PPI = 40

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Fig. 5

Effect of porous media and nanoparticles addition on the Nusselt number along the channel, ζ = 0.83%, u = 1.2 cm/s, and PPI = 20

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Fig. 6

Effect of different PPIs on the Nusselt number along the channel, ζ = 0.83%

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Fig. 7

Effect of particle concentration on the Nusselt Number along the channel, u = 1.2 cm/s and PPI = 20

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Fig. 8

Effect of nanoparticle size on the Nusselt number along the channel, ζ = 0.83% and PPI = 20

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