The lack of drinking water is a humanitarian problem that affects many regions, especially in arid areas. In our study, we examined the effectiveness of collecting water from fog using a prototype water harp. We designed an experimental chamber with controlled conditions, equipped with ultrasonic fog generators, a fan, humidity meters, and a high-speed video camera. Various harp configurations made of 0.2 mm and 0.4 mm diameter wires, with and without a hydrophobic coating, were analysed in two fog modes. The results show that a greater wire thickness increases the amount of water collected by approximately 35–40%, while a hydrophobic coating reduces efficiency by 40–50%. Fog density proved to be the most important factor, as the amount of collected water is almost double when the amount of fog produced is doubled. The highest recorded value was 295 l·m⁻²·day⁻¹ for a wire diameter of 0.4 mm without the use of a hydrophobic coating. The results obtained are oriented in such a way as to enable further work in this area. The first steps for further development would include: analysis of the quality of the collected water, a collection system for draining water from the harp, and further improvements with combination of hydrophilic and hydrophobic wires.
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