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

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.

Tribological analysis of surfactant modified nanolubricants containing CeO2nanoparticles

“…This effect becomes much more prominent at higher loads where the nanoparticles agglomerate 22 and provide more supporting effort to the contacting area. However, as the concentration is further increased, interaction between the solid particles themselves becomes dominant, which increases friction.…”

Molecular Dynamics Study of Aggregation in Nanofluid Flow: Effects of Liquid–Nanoparticle Interaction Strength and Particles Volume Fraction

“…The behavior of nanofluids at the nanometer scale has been a subject of interest in recent years [Li et al, 2008]. As a typical flow in the reduced-size fluid mechanics system, the nanofluid flow inside nanochannel embodies a series of special properties and has attracted much attention [Lv et al, 2011a[Lv et al, , 2011bCui et al, 2012aCui et al, , 2012b. The understanding of the physical properties and dynamical behavior of nanofluid flow inside nanochannel has great importance on the theoretical study of nanofluid dynamics and many engineering applications in physics, chemistry, medicine and electronics.…”

Molecular dynamics simulation of mechanism of nanoparticle in improving load-carrying capacity of lubricant film

“…Minimal investigations exist on anti-wear and anti-friction mechanisms of nanoparticles. Lv et al [26] studied the friction behavior of copper (Cu)-argon nanofluids between two solid plates using MD. However, they only analyzed nanoparticle movement under different pressures and did not consider the interaction between nanoparticles and base fluid.…”