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The molecular dynamic simulation on impact and friction characters of nanofluids with many nanoparticles system.

Lv J, Bai M, Cui W, Li X - Nanoscale Res Lett (2011)

Bottom Line: The Cu-Ar nanofluid model consisted of eight spherical copper nanoparticles with each particle diameter of 4 nm and argon atoms as base liquid.The Lennard-Jones potential function was adopted to deal with the interactions between atoms.In this process, agglomeration of nanoparticles was very apparent, with the pressure increasing, the phenomenon became more prominent.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China. lvjizu2002@yahoo.com.cn.

ABSTRACT
Impact and friction model of nanofluid for molecular dynamics simulation was built which consists of two Cu plates and Cu-Ar nanofluid. The Cu-Ar nanofluid model consisted of eight spherical copper nanoparticles with each particle diameter of 4 nm and argon atoms as base liquid. The Lennard-Jones potential function was adopted to deal with the interactions between atoms. Thus motion states and interaction of nanoparticles at different time through impact and friction process could be obtained and friction mechanism of nanofluids could be analyzed. In the friction process, nanoparticles showed motions of rotation and translation, but effected by the interactions of nanoparticles, the rotation of nanoparticles was trapped during the compression process. In this process, agglomeration of nanoparticles was very apparent, with the pressure increasing, the phenomenon became more prominent. The reunited nanoparticles would provide supporting efforts for the whole channel, and in the meantime reduced the contact between two friction surfaces, therefore, strengthened lubrication and decreased friction. In the condition of overlarge positive pressure, the nanoparticles would be crashed and formed particles on atomic level and strayed in base liquid.

No MeSH data available.


Related in: MedlinePlus

The simulation model consists of two plates and nanofluids between them. The nanofluids comprised eight Cu nanoparticles with the diameter of 4 nm and liquid Ar as base fluid. H is the height of the model, its initial value is 14.8 nm and it would change in impact process. The initial distance between two plates is 12.6 nm.
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Figure 1: The simulation model consists of two plates and nanofluids between them. The nanofluids comprised eight Cu nanoparticles with the diameter of 4 nm and liquid Ar as base fluid. H is the height of the model, its initial value is 14.8 nm and it would change in impact process. The initial distance between two plates is 12.6 nm.

Mentions: In this study, equilibrium molecular dynamics simulations are performed for nanofluids between two solid plates. As shown in Figure 1, the geometric model of the simulation cell has the size of 4.6 × 27.7 × 14.8 nm3 and the distance separated between two plates is 12.6 nm. We adopted a base fluid model of argon, a nanofluid model of copper particles in argon and two solid plates model of copper. Although argon is not a real base fluid material used in experiments, it is the best choice for an initial nanofluids impact and friction molecular dynamics study.


The molecular dynamic simulation on impact and friction characters of nanofluids with many nanoparticles system.

Lv J, Bai M, Cui W, Li X - Nanoscale Res Lett (2011)

The simulation model consists of two plates and nanofluids between them. The nanofluids comprised eight Cu nanoparticles with the diameter of 4 nm and liquid Ar as base fluid. H is the height of the model, its initial value is 14.8 nm and it would change in impact process. The initial distance between two plates is 12.6 nm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3211256&req=5

Figure 1: The simulation model consists of two plates and nanofluids between them. The nanofluids comprised eight Cu nanoparticles with the diameter of 4 nm and liquid Ar as base fluid. H is the height of the model, its initial value is 14.8 nm and it would change in impact process. The initial distance between two plates is 12.6 nm.
Mentions: In this study, equilibrium molecular dynamics simulations are performed for nanofluids between two solid plates. As shown in Figure 1, the geometric model of the simulation cell has the size of 4.6 × 27.7 × 14.8 nm3 and the distance separated between two plates is 12.6 nm. We adopted a base fluid model of argon, a nanofluid model of copper particles in argon and two solid plates model of copper. Although argon is not a real base fluid material used in experiments, it is the best choice for an initial nanofluids impact and friction molecular dynamics study.

Bottom Line: The Cu-Ar nanofluid model consisted of eight spherical copper nanoparticles with each particle diameter of 4 nm and argon atoms as base liquid.The Lennard-Jones potential function was adopted to deal with the interactions between atoms.In this process, agglomeration of nanoparticles was very apparent, with the pressure increasing, the phenomenon became more prominent.

View Article: PubMed Central - HTML - PubMed

Affiliation: State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China. lvjizu2002@yahoo.com.cn.

ABSTRACT
Impact and friction model of nanofluid for molecular dynamics simulation was built which consists of two Cu plates and Cu-Ar nanofluid. The Cu-Ar nanofluid model consisted of eight spherical copper nanoparticles with each particle diameter of 4 nm and argon atoms as base liquid. The Lennard-Jones potential function was adopted to deal with the interactions between atoms. Thus motion states and interaction of nanoparticles at different time through impact and friction process could be obtained and friction mechanism of nanofluids could be analyzed. In the friction process, nanoparticles showed motions of rotation and translation, but effected by the interactions of nanoparticles, the rotation of nanoparticles was trapped during the compression process. In this process, agglomeration of nanoparticles was very apparent, with the pressure increasing, the phenomenon became more prominent. The reunited nanoparticles would provide supporting efforts for the whole channel, and in the meantime reduced the contact between two friction surfaces, therefore, strengthened lubrication and decreased friction. In the condition of overlarge positive pressure, the nanoparticles would be crashed and formed particles on atomic level and strayed in base liquid.

No MeSH data available.


Related in: MedlinePlus