Fig. 6. Water collection via drops collisions between two parallel opposite surfaces (collision surfaces). In this test, relative humidity is close to 100%, the fog flow velocity of ∼0.6 m s−1 to ∼0.7 m s−1 and it does not impact on the sample surface, and the environment temperature is 22 ± 3 °C. (a) Schematic diagram of water collecting device. (b) The weight of collected water as a function of time, and the space between the two collision surfaces are various from ∼1 mm to ∼12 mm. (c) Time-lapse images for droplets jump and collide with each other to removal between two collision surfaces (S ≈ 2 mm).
