The application of Cassie equation to microscopic droplets is recently under intense debate because the microdroplet dimension is often of the same order of magnitude as the characteristic size of substrate heterogeneities, and the mechanism to describe the contact angle of microdroplets is not clear. By representing real surfaces statistically as an ensemble of patterned surfaces with randomly...

We study the phase equilibria of a fluid confined in an open capillary slit formed when wall finite length $H$ is brought distance $L$ away from second macroscopic surface. This system shows rich arising competition between two different types condensation, corner filling and meniscus depinning transitions depending on value aspect ratio $a=L/H$. For long capillaries, with $a<2/\ensuremath{\...

The produced liquid water in cathode catalyst layer (CCL) has significant effect on the operation of proton exchange membrane fuel cell (PEMFC). To investigate this effect, the transport of oxygen in CCL in the presence of immiscible liquid water is studied applying a two-dimensional pore scale model. The CCL was reconstructed as an agglomerated system. To explore the wettability effects, diffe...