Modeling of Contact Angle for a Liquid in Contact with a Rough Surface for Various Wetting Regimes

The roughness distributionRoughness distribution affects contact angleContact angle and surface wettingWetting. Three surface wettingWetting regimes are discussed, which include WenzelWenzel, Cassie-BaxterCassie-baxter, and Cassie regimes. In the Wenzel regimeWenzel regime, a liquid droplet completely wets the rough surface with a homogeneous interfaceHomogeneous interface. In the Cassie-Baxter regimeCassie-Baxter regime, a heterogeneous or composite interfaceComposite interface with air pockets trapped between the asperitiesAsperities is formed. In a Cassie regime, a liquid film impregnates some of the cavities in an area surrounding the droplet as well.