Study of the Impact of Passive, Active, and Combined Measures on the Reduction of Hydrodynamic Resistance (SACT-HR)

In recent years, it has been increasingly recognized that reducing fuel consumption in the maritime transport sector is crucial in order to decrease the amount of greenhouse gas emissions. It is estimated that nearly 90% of global trade is conducted by ships. While transporting such a vast quantity of goods, ships emit approximately 3% of the world’s CO2, 14-15% of NOX (nitrogen oxides), and about 16% of SOX (sulfur oxides) greenhouse gases. Growing environmental concerns and the adoption of various emission-related regulations encourage ship manufacturers and owners to choose more efficient and environmentally friendly ship models. Considering thecontinuous growth of international trade, an increase in emissions and air pollutants can also be expected. One method to reduce harmful emissions and fossil fuel consumption in the shipping sector is minimizing hydrodynamic resistance and friction. Hydrophobic coatings, textured, and otherwise modified surfaces are highly effective friction-reducing solutions. By creating an air gap between the liquid and the solid surface, these technologies allow objects to glide over water with minimal resistance. In this work, the effect of passive measures, the Leidenfrost effect, and combined tools on reducing hydrodynamic drag will be investigated. Additionally, the research will determine the critical temperatures for the Leidenfrost effect on various surfaces, analyze the coated surfaces, and observe changes in the surface structures of the samples. The experimental data will be used to calculate the main heat transfer parameters and to develop a numerical hydrodynamic model (CFD). Imagine analysis techniques will be applied to the experimental vapour film formation.

Keywords: Mono-nano coating, texturing, friction reduction, hydrodynamic resistance, hydrophobicity, the Leidenfrost effect, second-degree boiling crisis.

Budget: 20 000 EUR