Adding a small amount of nanoparticles to conventional fluids (nanofluids) has been proved to be an effective
way for improving capability of heat transferring in base fluids. The change in micro structure of base fluids and micro
motion of nanoparticles may be key factors for heat transfer enhancement of nanofluids. Therefore, it is essential to
examine these mechanisms on microscopic level. The present work performed a Molecular Dynamics simulation on
Couette flow of nanofluids and investigated the microscopic flow characteristics through visual observation and statistic
analysis. It was found that the even-distributed liquid argon atoms near solid surfaces of nanoparticles could be seemed as
a reform to base liquid and had contributed to heat transfer enhancement. In the process of Couette flow, nanoparticles
moved quickly in the shear direction accompanying with motions of rotation and vibration in the other two directions.
When the shearing velocity was increased, the motions of nanoparticles were strengthened significantly. The motions of
nanoparticles could disturb the continuity of fluid and strengthen partial flowing around nanoparticles, and further
enhanced heat transferring in nanofluids.
Wavy Taylor vortices in molecular dynamics simulation of cylindrical Couette flow
