Influence of np size and concentration on the physical properties of glycerol cu 2 o nanofluid
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ICNMRE SAFI/MOROCCO July 5-8 2010. Influence of NP size and concentration on the physical properties of Glycerol/Cu 2 O nanofluid. R. HEYD CRMD/UMR 6619 – ORLÉANS/France LPN/ENS – Marrakech/Maroc FFSM/Cadi Ayyad University – Marrakech/Maroc. The problem.

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Influence of NP size and concentration on the physical properties of Glycerol/Cu 2 O nanofluid

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Influence of np size and concentration on the physical properties of glycerol cu 2 o nanofluid

ICNMRE

SAFI/MOROCCO

July 5-8 2010

Influence of NP size and concentration on the physical properties of Glycerol/Cu2O nanofluid

R. HEYD

CRMD/UMR 6619 – ORLÉANS/France

LPN/ENS – Marrakech/Maroc

FFSM/Cadi Ayyad University – Marrakech/Maroc


The problem

The problem

  • Liquids are used as heat carriers in:

Diesel engine

Solar hot water panels


The problem1

The problem

Thermal conductivities, (λ) at RT.

  • Fourier’s law:

  • How to combine:

    • flow properties of liquids &

    • high thermal conductivity of solid metals.

  • Using a new class of nanocomposites: liquid/solid?


Cuprite nanoparticles nanofluid

Cuprite Nanoparticles/Nanofluid

  • Cu2O nanoparticles:

    • Two extreme diameters were used:

synthesized by reverse micelles at CRMD/Orléans (see poster for more details)

purchased from Sigma-Aldrich


Cuprite nanoparticles nanofluid1

Cuprite Nanoparticles/Nanofluid

  • Nanofluid synthesis:

=

Glycerol (biocompatible and anti-freezing liquid)

+

Cu2O nanoparticles in stable suspension

  • Objectives: Test the influence of Cu2O NP on Glycerol’s transport properties, as a function of:

  • NP size

  • NP concentration


Rheological properties

Rheological properties

  • Experimental/Results

    • Kinexus rotational Rheometer

    • General Arrhenius Law:


Rheological properties1

Rheological properties

  • Experimental/Results

    • Variations of relative viscosity with NP volume fraction at RT


Rheological properties2

Rheological properties

  • Summary:

    • The addition of NP slightly increases the viscosity,

    • NP size has little influence,

    • The studied nanofluids tested exhibit the same general Arrhenius law as glycerol,

    • Viscosity increases with the NP volume fraction ϕ.


Thermal properties

Thermal properties

  • Experimental: technique

Ref :

Development of absolute hot-wire anemometry by the 3ω method, R. Heyd et al, 044901. In Review of Scientific Instruments 81 (4), 2010.


Thermal properties1

Thermal properties

  • Results:

Investigations of thermal conductivity and viscosity of nanofluids, S.M.S. Murshed, K.C. Leong, C. Yang, International Journal of Thermal Sciences 47 (2008) 560–568.


Thermal properties2

Thermal properties

  • Results:


Thermal properties3

Thermal properties

  • Summary:

    • Linear variation of the effective thermal conductivity of nanofluids with temperature,

    • Significant enhancement of the thermal conductivity with volume fraction and with NP size.


Conclusion perspectives

Conclusion & Perspectives

  • The influence of increasing temperature on NP Brownian motion is:

    • Decreasing the viscosity of glycerol and consequently that of the nanofluid

    • Increasing the micro-convective contribution of the NP and consequently the thermal conductivity increases

  • Influence of NP shape, size and interfacial layer on transport coefficients has to be taken into account.

  • Investigation of electrical properties of nanofluids as a function of NP.

  • Development of a microscopic model to better describe transport phenomena in nanofluids.


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