In this work, stable homogeneous nanofluids were designed
as dispersions of sulfonic acid-functionalized graphene
nanoplatelets in an (ethylene glycol + water) mixture at
(10:90)% mass ratio and nanoparticle mass concentrations up to
0.5 wt.%. Nanofluid stability was evaluated by means of
Dynamic Light Scattering (DLS) and Zeta Potential
measurements. The thermal conductivity and dynamic viscosity
of base fluid and nanofluids were experimentally obtained in
the temperature range from (283.15 to 343.15) K by using a
TPS 2500S Hot Disk and an AR-G2 rotational rheometer,
respectively. Thermal conductivity improvements reach up to
5% while the maximum dynamic viscosity increase is 12.6%.
Finally, the experimental values of these two transport
properties were also utilized to analyze nanoparticle
concentration effect on heat transfer performance and pumping
power through different figures of merit.
Papers presented to the 12th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Costa de Sol, Spain on 11-13 July 2016.