Abstract
The influence of dispersing agents of organic (CTAB) and inorganic (sodium pyrophosphate and sodium silicate) nature on the critical heat flux and the heat transfer coefficients during boiling of various water-based nanofluids under free convection has been studied. It has been established that addition of ionic dispersants to aluminosilicate nanofluids, increasing the aggregative and sedimentation stability of the latter, impairs, as a rule, their thermal parameters during boiling causing a sudden precrisis burnout of the heater in the installation powered by direct current. The mechanism of the phenomenon under investigation has been established. It is shown that dispersants and surfactants added to carbon-containing nanofluids with high thermal conductivity, enhancing the stability of the latter, increase, however, the heat transfer coefficient at boiling and cause precrisis burnout of the heater powered by direct current. The influence of dispersants on the crisis phenomena under boiling of water and nanofluids has been analyzed and the causes of sudden precrisis burnout of the heater have been identified. Several mechanisms for interpretation of the effects observed have been proposed. The reasonability of using alternating current for heating and nonionic nonfoaming surfactants and dispersants for prevention of the early onset of the boiling crisis in order to achieve higher values of the critical heat flux and heat transfer coefficient under boiling of nanofluids has been substantiated.
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This work was supported by the Support for the Development of Priority Research Areas Program, project no. KPKVK 6541230.
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Translated by O. Lotova
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Moraru, V.N., Bondarenko, B.I., Sidorenko, S.V. et al. Nanofluids for Power Engineering: The Mechanism of the Influence of Dispersing Agents on the Thermal Parameters and Crisis Phenomena during Boiling. Tech. Phys. 65, 163–173 (2020). https://doi.org/10.1134/S1063784220020140
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DOI: https://doi.org/10.1134/S1063784220020140