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Influence of liquid-gas interface dynamics in superhydrophobic surfaces for drag reduction

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Direct numerical simulation (DNS) is used to investigate liquid flow in turbulent channels with superhydrophobic surfaces. The effect of the gas bubbles trapped between surface protrusions is modeled as both a slip effect and, for the first time in literature, a deforming interface. The dynamics of the interface are modeled with a linearized boundary condition, derived from the equilibrium between the surface tension and the pressure jump across the interface. We study two- and three-dimensional patterned surfaces, analyzing the effect of the surface tension and the pattern geometry and alignment.

Author(s):

Jongmin Seo    
Stanford University
United States

Ricardo García-Mayoral    
Stanford University
United States

Ali Mani    
Stanford University
United States