An experimental study has been made of the viscosity and rheology of water- and ethylene-glycol-based nanofluids with single-walled carbon nanotubes, and also of their dependence on temperature. The mass concentration of the nanotubes ranged from 0.05 to 1%. Polyvinyl pyrrolidone and sodium dodecyl benzenesulfate were used as dispersants. The dimensions of the single-walled nanotubes were determined by the method of dynamic light scattering. Preliminary study of the viscosity and rheology of basic fluids has shown that they are Newtonian fluids. However, all the studied fluids turned out to be pseudoplastic non-Newtonian fluids. It has been established that with growth in the concentration of nanotubes in a fluid, its index decreases, and the consistency parameter increases. With increase in the temperature of a nanofluid, its viscosity decreases. The change in the temperature of a nanofluid exerts an influence on its rheology: the consistency parameter of the nanofluid increases, and its index decreases, and this influence increases as the concentration of nanotubes in the nanofluid grows. Ultrasonic treatment of the nanofluid leads to a partial degradation of dispersants in it and to an increase in its viscosity. Measures on restoring the properties of long-stored nanofluids have been discussed.
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Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 94, No. 5, pp. 1235–1244, September–October, 2021.
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Rudyak, V.Y., Tret’yakov, D.S. Rheological Properties of Water- and Ethylene-Glycol-Based Nanofluids with Single-Walled Carbon Nanotubes. J Eng Phys Thermophy 94, 1208–1216 (2021). https://doi.org/10.1007/s10891-021-02401-x
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DOI: https://doi.org/10.1007/s10891-021-02401-x