Zusammenfassung
The thermal conductivity and stability of nanofluids have posed the biggest
challenges to their adoption as coolants in thermal applications in industries
such as electronic equipment, heat exchangers, and solar technologies. In this
paper, the thermal conductivity coefficient of an Al$_12$Mg$_17$ nanofluid
is measured by a novel beam displacement method. Besides, the stability,
particle size distribution (PSD), TEM micrograph, and electrical conductivity
of Al$_12$Mg$_17$ nanofluids are investigated. For the preparation of
nanofluids, three different surfactants are used to disperse Al$_12$Mg$_17$
nanoparticles in DI water using two-step method. Then, dispersion stability is
monitored visually and quantified using a zeta potential test. The thermal
conductivity coefficient and particle size distribution are measured using two
optical setups. For the purpose of evaluating the outcomes, the thermal
conductivity coefficients estimated using the beam displacement method are
compared with the KD2 Pro apparatus results, and the PSD findings are examined
using TEM micrographs. Results demonstrate that a 1:1 ratio of CTAB and
Al$_12$Mg$_17$ nanoparticles is proper for stabilizing Al$_12$Mg$_17$
nanofluid. Also, the optimum ultrasonication period is determined to be 2
hours, and the peak of particle size distribution is measured to be 154
nanometers at this time. Thermal conductivity measurements show that the
thermal conductivity coefficients improve as the concentration of
Al$_12$Mg$_17$ nanoparticles increases, reaching a maximum enhancement of
40% in comparison to the base fluid at a concentration of 0.05 vol.%.
Nutzer