Dispersion stability and viscosity characterization of seawater-based nanofluids
Nanofluids based on seawater can be used as hydraulic medium in marine hydraulic equipment to solve the problem of fluid deterioration caused by seawater intrusion in traditional hydraulic fluids.In this paper,sea-water-based SiC nanofluids were prepared by a two-step method using natural seawater as the base fluid,and the dispersion stability and viscosity characteristics of nanofluids with different group distribution ratios were investigated by the single-variable method.The results showed that NaCl destroyed the particle double electric layer and reduced the nanofluid stabilization coefficient,but the surfactant CMC could be adsorbed on the sur-face of SiC particles to provide spatial site resistance,so that the stabilization coefficient was maintained at a-bout 0.9 within 10 days.Meanwhile,it was verified that the best nanofluid dispersion stability was achieved with SiC particle size at 40 nm,mass fraction at around 1％,and CMC mass fraction at around 2％.The viscosi-ty of seawater-based nanofluid increased with the increase of particle addition,and the rising trend slowed down when the mass fraction was greater than 1％.With the increase of CMC addition,the microstructure in the nanofluid was affected,so that the viscosity of the seawater-based nanofluid increased with the increase of the CMC mass fraction,and the rising trend was smooth-sharp-smooth.The viscosity was negatively correlated to the temperature by the effect of Brownian motion,and the viscosity of the nanofluid decreased with the increase of NaCl mass fraction,and the decreasing trend was fast and then slow.The seawater-based nanofluids prepared in this paper have good dispersion stability,and the desired viscosity can be obtained by regulating the group distribution ratio,which is helpful for the further development of nanofluid technology.
seawater-based nanofluidssilicon carbidedispersion stabilityviscosity propertieshydraulic medium
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