FIELD: energy-saving technology.
SUBSTANCE: invention relates to energy-saving technology and thermal power engineering, and in particular to a method for forming a hydrophilic coating from aluminum oxide nanoparticles on a heat exchange surface. To implement this method, the following operations are carried out. Grooves with a width of 10 µm to 100 µm are cut on said surface. The said surface is heated up to 50-100°C. A nanofluid consisting of aluminum oxide nanoparticles 50 to 100 nm in size and isopropanol is applied to the heat exchange surface. The liquid is evaporated from said nanofluid at atmospheric pressure in air and the application of said nanofluid and liquid evaporation from the nanofluid are repeated 10 to 15 times.
EFFECT: invention provides an increase in heat transfer during evaporation and boiling by increasing the area of evaporation and increasing the centers of vaporization during boiling.
1 cl, 3 dwg
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