Journal of Northeastern University Natural Science ›› 2015, Vol. 36 ›› Issue (3): 415-418.DOI: 10.12068/j.issn.1005-3026.2015.03.025

• Mechanical Engineering • Previous Articles     Next Articles

Molecular Dynamics Simulation of the Effect of Nanoparticles on the Tribological Properties of Lubricant Film

HU Cheng-zhi, BAI Min-li, LYU Ji-zu, WANG Peng   

  1. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, China.
  • Received:2013-10-13 Revised:2013-10-13 Online:2015-03-15 Published:2014-11-07
  • Contact: LYU Ji-zu
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Abstract: The lubricant film has excellent load-carrying capacity, anti wear and friction-reducing properties with the addition of nanoparticles, but the physical mechanism is still unclear. Using molecular dynamics simulation, the difference of tribological properties between nanofluid and base fluid was studied when the lubricant film was confined to idealized atomistic surfaces. The interaction between nanoparticles and base fluid was studied. The results indicate that:under high load, liquid-solid transition takes place for both base fluid and nanofluid; the critical pressure of nanofluid phase transition is higher than that of the base fluid. After phase transition, nanofluid shows excellent friction-reducing properties. Nanoparticles can also increase the load-carrying capacity effectively and the enhancement effect is better after phase transition. The mechanisms responsible for the nanofluids friction properties are explained in detail.

Key words: nanofluids, molecular dynamics, tribological properties, phase transition, load-carrying capacity

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