Scientists from Tomsk Polytechnic University (TPU) have conducted a comprehensive study aimed at examining how the speed and characteristics of impact on a micro-textured surface affect the formation of a crown in water droplets. The results will form the basis for the development of water-repellent coatings for wind and gas turbine blades, as well as aircraft anti-icing systems, according to the press service of the Ministry of Education and Science of the Russian Federation.
We have established that the micro- and nanostructure of the surface affects the symmetry of the droplet crown and the rate of splashing. Thus, on micro-textured surfaces, the droplet crown will be symmetrical and stable, while on rough, untreated surfaces, it will be asymmetrical. At the same time, the removal of liquid during the decay of the crown may slow down depending on the level of roughness.
Testing showed that the model accurately predicts the diameter of the crown with an error of no more than 20% for water and ethanol droplets, which corresponds to the stated parameters.
Based on experimental data, the researchers developed an empirical model that allows predicting the degree of development of the crown in droplets, as well as their diameter at the moment of decay.
The model created by specialists from the Polytechnic University takes into account the inertial properties of droplets and surface adhesion.
Earlier, www1.ru reported that Rostec plans to increase the annual production of Il-114-300, SJ-100, MS-21, and Tu-214 by 2030.
