Simulation of spreading and retraction behavior of water droplet on micro-patterned surfaces with VOF coupled level-set model
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For the anti-icing technology of hydrophobic coating on turbine blades, the influence of the hydrophobic surface withmicropatterns on the impact characteristics of water droplets is studied in present manuscript. The spreading and retractioncharacteristics of water droplets with diameters of 2~10 μm on micro-structured surface is numerically investigated in presentresearch by volume of fluid (VOF) and Level-set coupling method, and the influence of surface micropattern geometry andwater droplet diameter on the spreading and retraction process is analyzed in detail. It is found that the ratio of water dropletdiameter D0 to micropattern size P has a significant effect on the dynamic process and final shape of the impact on the samemicropatterned wall; and the surface shows obvious hydrophobicity when the ratio of water droplet diameter D0 tomicropattern size P is 2 ≤ D0/P ≤ 4 and the movement of water droplets on the surface is in accordance with the descriptionof the Cassie model, although the contact angle of substrate material is 86°. However, the dynamic process and final shape ofwater droplets are similar to those on a smooth plane with the contact angle of 86° when D0/P ≤ 1. In addition, when the waterdroplet impacts the micropatterned surface with 2 ≤ D0/P ≤ 4, the spreading coefficient on the micropattern surface is less than1.0 and the dimensionless spreading period gradually lengthens with the increase of D0/P value attributed to the large pressuregradient near the three-phase line.
Abstract
For the anti-icing technology of hydrophobic coating on turbine blades, the influence of the hydrophobic surface withmicropatterns on the impact characteristics of water droplets is studied in present manuscript. The spreading and retractioncharacteristics of water droplets with diameters of 2~10 μm on micro-structured surface is numerically investigated in presentresearch by volume of fluid (VOF) and Level-set coupling method, and the influence of surface micropattern geometry andwater droplet diameter on the spreading and retraction process is analyzed in detail. It is found that the ratio of water dropletdiameter D0 to micropattern size P has a significant effect on the dynamic process and final shape of the impact on the samemicropatterned wall; and the surface shows obvious hydrophobicity when the ratio of water droplet diameter D0 tomicropattern size P is 2 ≤ D0/P ≤ 4 and the movement of water droplets on the surface is in accordance with the descriptionof the Cassie model, although the contact angle of substrate material is 86°. However, the dynamic process and final shape ofwater droplets are similar to those on a smooth plane with the contact angle of 86° when D0/P ≤ 1. In addition, when the waterdroplet impacts the micropatterned surface with 2 ≤ D0/P ≤ 4, the spreading coefficient on the micropattern surface is less than1.0 and the dimensionless spreading period gradually lengthens with the increase of D0/P value attributed to the large pressuregradient near the three-phase line.
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