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Research Papers

Molecular Dynamics Simulation on Effect of Nanoparticle Aggregation on Transport Properties of a Nanofluid1

[+] Author and Article Information
Hongbo Kang, Ling Li

College of Energy and Power Engineering,
University of Shanghai for Science
and Technology,
Shanghai, 200093, China

Yuwen Zhang

Fellow ASME
Department of Mechanical
and Aerospace Engineering,
University of Missouri,
Columbia, MO 65211
email: zhangyu@missouri.edu

This work was completed during the first author's visiting appointment at the University of Missouri.

2Corresponding author.

Manuscript received November 19, 2011; final manuscript received May 30, 2012; published online September 24, 2012. Assoc. Editor: Henry Hess.

J. Nanotechnol. Eng. Med 3(2), 021001 (Sep 24, 2012) (6 pages) doi:10.1115/1.4007044 History: Received November 19, 2011; Revised May 30, 2012

Effect of nanoparticle aggregation on the transport properties that include thermal conductivity and viscosity of nanofluids is studied by molecular dynamics (MD) simulation. Unlike many other MD simulations on nanofluids which have only one nanoparticle in the simulation box with periodic boundary condition, in this work, multiple nanoparticles are placed in the simulation box which makes it possible to simulate the aggregation of the nanoparticles. Thermal conductivity and viscosity of the nanofluid are calculated using Green–Kubo method and results show that the nanoparticle aggregation induces a significant enhancement of thermal conductivity in nanofluid, while the increase of viscosity is moderate. The results also indicate that different configurations of the nanoparticle cluster result in different enhancements of thermal conductivity and increase of viscosity in the nanofluid.

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References

Figures

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Fig. 1

Thermal conductivity of pure argon using G–K method

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Fig. 2

Shear viscosity of pure argon using G–K method

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Fig. 3

Comparison of results in thermal conductivity and shear viscosity for different number of nanoparticles

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Fig. 4

Aggregation of nanoparticles

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Fig. 5

Different configurations of nanoparticle clustering

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