Nonwetting of impinging droplets on textured surfaces

作者：Deng Tao^*; Varanasi Kripa K; Hsu Ming; Bhate Nitin; Keimel Chris; Stein Judith; Blohm Margaret

来源：Applied Physics Letters, 2009, 94(13): 133109.

DOI：10.1063/1.3110054

• drops
• hydrophobicity
• surface texture
• wetting

This paper studies the impinging droplets on superhydrophobic textured surfaces and proposes a design guideline for nonwetting surfaces under droplet impingement. A new wetting pressure, the effective water hammer pressure, is introduced in the study to clearly define wetting states for the impinging droplets. This approach establishes the design criteria for nonwetting surfaces to impinging droplets. For impingement speed higher than raindrop speed, the surfaces need to have sub-100-nm features to generate a large enough antiwetting pressure for the droplets to take a nonwetting state after impingement.

• 出版日期2009-3-30