Akademik Veri Yönetim Sistemi
Journal of Nanofluids, cilt.12, sa.8, ss.2263-2272, 2023 (ESCI)
This study presents the effects of the volume fraction of nanoparticles (0.15%
≤
≤ 0.74%) with
ascorbic acid additive on some thermophysical characteristics of water based CuO nanofluids, such
as thermal conductivity and viscosity, as well as agglomeration by analyzing microstructure, adhesion
and precipitation time. The CuO nanofluids have been prepared and examined for five different
volume fractions by using appropriate mixers. The microstructure of the samples, which are prepared
with ascorbic acid additive in order to prevent the agglomeration of CuO nanoparticles and to ensure
a homogeneous distribution, has been analyzed on the SEM images. In the adhesion experiments, an
observational test was performed for 0.23% CuO-water sample. The samples prepared have been kept
about 100 hours for observational examination of precipitation similar to the adhesion test. Thermal
conductivity measurements have been conducted in a standard experimental set-up and a correlation
equation has been proposed based on data acquired. The viscosity measurements have been carried
out using a calibrated "falling-piston viscometer" and a correlation equation was also defined for
thermal conductivity. The thermal conductivity measurements of the study have been compared to
experiments given in the literature and a good agreement has been obtained at low volume fractions
(less than 0.5%).