  A thermal transport mechanism leading to the enhanced thermal conductivity of
Graphene nanofluids has been proposed. The Graphene sheet size is postulated to
be the key to the underlying mechanism. Based on a critical sheet size derived
from Stokes-Einstein equation for the poly-dispersed nanofluid, sheet
percolation and Brownian motion assisted sheet collisions are used to explain
the heat conduction. A collision dependant dynamic conductivity considering
Debye approximated volumetric specific heat due to phonon transport in Graphene
has been incorporated. The model has been found to be in good agreement with
experimental data.
