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.