The micro movement of nanoparticles makes the
microconvection phenomena exists between particles and liquid.
This kind of microconvection enhances the energy transfer process
between the particles and liquid, which increased the thermal
conductivity of nanofluids. Most important of all, in the particle
movement also with the migration of energy at the same time. This
part of the energy transfer is closely related to the movement intensity
of the particles. The scale of the particle is smaller, the
greater the intensity of micromotion, the more frequently the
nanoparticles move. It will lead to the nanofluids internal energy
transfer rate faster, which make the thermal conductivity of
nanofluids greater.