The molecular dynamic simulation on impact and friction characters of nanofluids with many nanoparticles system |
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Authors: | Jizu Lv Minli Bai Wenzheng Cui Xiaojie Li |
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Affiliation: | (1) State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian, 116024, China;(2) School of Energy and Power Engineering, Dalian University of Technology, Dalian, 116024, China |
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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. |
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