NANOFLUID’S VISCOSITY INVESTIGATION USING MOLECULAR DYNAMICS SIMULATIONS
Nanofluids have been proposed as a route for surpassing the performance of currently available heat transfer liquids in the near future. In this study an equilibrium molecular dynamics simulation was used to investigate the enhancement of the copper-argon nanofluid’s viscosity. The viscosity of the base fluid and nanofluid was computed using the Green-Kubo method. For base fluid, the collective pressure tensor vector has been separated into contributions originated at the kinetic energy and the pair virial function. The pair virial term plays more important contribution than the kinetic term. Furthermore, the microscopic stress tensor of copperargon nanofluid is decomposed into three parts, namely, liquid, solid, and the interaction between the two parts. The Cu-Cu interaction, evidently the strongest in the system, plays only a minor role in the viscosity increase while the interaction between Ar and Cu, the next strongest, plays a dominant role in the viscosity increase. By tracking the movement of the solid nanoparticle and the liquid atoms, it was found that a thin layer of liquid is formed at the interface between the nanoparticle and liquid; and this layer moves with the Brownian motion of the nanoparticle, thus augmenting the effective volume fraction of the particle.
Jun Chen Lin Shi Qingsong An
Key Laboratory of Thermal Science and Power Engineering of Ministry of Education singhua University, Key Laboratory of Thermal Science and Power Engineering of Ministry of Education Tsinghua University
国际会议
The Ninth Asian Thermophysical Properties Conference(第九届亚洲热物理性能会议 ATPC 2010)
北京
英文
725-732
2010-10-19（万方平台首次上网日期，不代表论文的发表时间）