Abstract:
Experiments undertaken with SiO2 nanoparticles dispersed
in ethylene glycol (EG) and water mixtures in the ratios of
60:40 and 40:60 by volume are reported in the literature for
heat transfer and friction factor. The influence of concentration
and temperature on heat transfer coefficient and friction factor
have been determined. In this current study a theoretical model
is developed to study the base fluid mixture ratios influence on
heat transfer coefficient and flow characteristics in the turbulent
range of Reynolds number employing the eddy diffusivity
equation of van Driest. Two different base fluid mixture ratios
of EG and Water mixed in 60:40 and 40:60 ratio by volume
were considered for dispersing SiO2 nanoparticles. The
property Enhancement Ratio of nanofluids for the two mixtures
could depict the experimental observation of heat transfer
enhancement. The temperature gradient is lower for EGW
40:60 mixture compared to 60:40 mixture. The Prandtl index
decreases with an increase in nanofluid concentration and
particle density. The numerical results indicate greater values of
heat transfer coefficients with EGW of 40:60 mixture ratio
compared to 60:40 ratio when plotted with velocity under
identical conditions.
Description:
Papers presented at the 13th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Portoroz, Slovenia on 17-19 July 2017 .
