Nanofluids, Stability, Thermal Conductivity, CO2 Absorption
In this study, the nanofluids are produced by dispersing Al2O3 nanoparticles in the H2O/CH3OH binary mixtures using an ultrasonic equipment. Solid Sodium Chlorides (NaCl) with a fixed mass fraction are dissolved in the binary mixture for CO2 absorption. The main objective of this paper is to measure the thermal conductivity of the Al2O3 nanofluids using the transient hot-wire method. The experimental uncertainties in repeatability are obtained as 1.95% for DI water and 1.34% for pure methanol, respectively. The results show that the dispersed nanoparticles can always enhance the thermal conductivity of the basefluid and the highest enhancement is observed to be 6.3% in the concentration of 0.1vol% of Al2O3 nanoparticles, 40vol% of CH3OH and 10wt% of NaCl at 293.15 K. In addition, the zeta potential, visualization and Tyndall effect are investigated to discuss the stability of the present nanofluids.