influence of np size and concentration on the physical properties of glycerol cu 2 o nanofluid n.
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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

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 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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