NANOFLUIDS ON THE BASIS OF UKRAINIAN NATURAL ALUMINOSILICATES ARE PROMISING HEAT-CARRIERS FOR POWER ENGINEERING
Ukrainian natural aluminosilicates — montmorillonite, attapulgite and their genetic mixture with montmorillonite with scaly, plate-like and needle shape of nanoparticles were used to create nanodispersions for energetics. The nanodimension, the different form and anisometry of their particles, high wetting ability of surface and the ability to spontaneous dispersion in water solutions — all these characteristics predetermine high heat parameters of these nanofluids as heat agents especially at boiling. The boiling curves of nanofluids in conditions of free convection have been obtained. The aim of this study is to investigate the influence of nanoparticles shape (anisometry), as well as ratio of nanofluids boiling-cooling and presence of dispersants on their stability, critical heat flux and the state of the heating surface. It was found that attapulgite nanofluid with particles of similar size, but having a greater anisometry, causes a stronger increase of critical heat flux (up to 2,5–3 times) than the montmorillonite nanofluid (1,4–1,9 times) with the same particles volume concentration. Bibl. 32, Fig. 5, Table 1.
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