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Composite Rough Surface - Hydrophilic Porous Surfaces Ratio: 1-s Contact angle: 0 Liquid Vapor Ratio: Ps Contact angle: 0g Q1: From the Cassie-Baxter model, obtain cos 0 for this surface. cos 81s+s cos E Eq. (2) →inconsistent with Wenzel's model because e cannot be zero. Q2: (another condition is necessary for being close to total wetting) Prove that the intersection of Eqs. (1) & (2) corresponds to rdx: Increase in total area when unit-length contact line is displaced by dr dx: area of dry top surface when unit-length contact line is displaced by 1-0s cos = r-Ds cos E > 1- Þs T-OS 26 The condition that grooves are filled with water: dE < 0, where dE=(rs) (YSLYSV) de+(1-Ps) 7LV dx -
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Transcribed Image Text:Composite Rough Surface - Hydrophilic Porous Surfaces Ratio: 1-s Contact angle: 0 Liquid Vapor Ratio: Ps Contact angle: 0g Q1: From the Cassie-Baxter model, obtain cos 0 for this surface. cos 81s+s cos E Eq. (2) →inconsistent with Wenzel's model because e cannot be zero. Q2: (another condition is necessary for being close to total wetting) Prove that the intersection of Eqs. (1) & (2) corresponds to rdx: Increase in total area when unit-length contact line is displaced by dr dx: area of dry top surface when unit-length contact line is displaced by 1-0s cos = r-Ds cos E > 1- Þs T-OS 26 The condition that grooves are filled with water: dE < 0, where dE=(rs) (YSLYSV) de+(1-Ps) 7LV dx -
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