Fig. 1
From: On the specific heat capacity enhancement in nanofluids
Specific heat capacity of the nanofluid vs. particle volume fraction. Top: Specific heat capacity of water-based nanofluids. Experimental data are taken from Figs. 2 and 8 in [13] (open symbols: silica; closed symbols: alumina). The temperature is 45 °C. Dashed lines: Eq. 1. Solid lines: Eq. 5 using λ=1.05 (silica) and λ=1.2 (alumina). Bottom: Specific heat capacities for NaNO 3/KNO 3 (60:40) doped with alumina nanoparticles. Symbols: data from Figure 5 in [25]. Two different size nanoparticles are used: 13 nm (solid symbols) and 90 nm (hollow symbols). Solid lines: Eq. 5 using λ=2.2 (13 nm particle size) and λ=1.7 (90 nm particle size). The other quantities needed to evaluate Eq. 5 were taken from [25]