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