Figure 10 Comparison of
experimental values of thermal conductivity for
SiO2/40EGW nanofluids with theoretical correlation (15)
Given the 60EGW and 40EGW-based nanofluids, Figure 11summarizes the experimental results that were obtained regarding the
parameter of thermal conductivity. From the figure, it is evident that
when thermal conductivity is the focal factor,
SiO2/40EGW-based nanofluids demonstrate higher
enhancement, proving superior when compared to cases involving
SiO2/60EGW-based nanofluids. It is always desirable to
examine the nondimensional thermal conductivity ratio\(kr\ (=k\text{nf}/k\text{bf})\) of the nanofluid, when it is
normalized by the base fluid value, because the thermal behavior will
also include the influence of the base fluid. This ratio, called the
relative thermal conductivity is plotted against temperature for the two
given nanofluids.