Geração de vapor em nanofluídos contendo misturas de nanopartículas metálicas

Abstract

This work analyzed the steam generation processes in nanofluids containing mixtures of metallic NiO nanoparticles being excited by a xenon lamp. The analyzes were divided into two sets, A and B, and it was possible to observe that with the presence of nanoparticles there was a significant improvement in the water evaporation rate. In set A, the greatest variation in the evaporation rate occurred in the Am2 sample and reached a rate of 85%, that is, an 85% greater efficiency in steam generation compared to the pure water. While in set B, sample Am4 reached a rate of 82%. These results indicate the influence of nanoparticles on the steam generation process in nanofluids. It is important to highlight that for both sets, the maximum concentration of nanoparticles in the first samples did not directly correspond to the maximum evaporation rate. This suggests that an optimal concentration, to obtain a maximum evaporation rate, is not necessarily linked to the maximum concentration of NiO nanoparticles. In addition, measurements were taken in relation to the initial volume of the sample, keeping the concentration of NiO nanoparticles constant. And with the analysis of these samples it was possible to identify that there is an increase in the evaporated mass with the volume, and this may indicate that from a certain initial volume, the evaporated mass should not vary significantly.