Abstract
In this paper, the measurement process of advancing and receding contact angles (CA) in experiments is simulated using Surface Evolver (SE). The normalized energy of the droplet is calculated by fixing the three-phase contact line that lies at the boundary between stripes and by changing the droplet volume. The most stable wetting state is determined for each stripe configuration. The slip–jump behavior of the three-phase contact line is observed. Furthermore, a small wet stripe width and large dry stripe width is found to be favorable for achieving large stable equilibrium CA. Moreover, the minimum advancing CA and maximum receding CA can be obtained by assigning a value of zero to the normalized energy barrier. The variation of minimum advancing CA and maximum receding CA with wet and dry stripe widths follows the same trend as the stable equilibrium CA. Combined with the existing model in the literature, the approach introduced in this paper can be used to narrow down the predicted range of dynamic CAs and also to provide guidance for designing anisotropic surfaces.
Highlights
Surfaces with unique wettability have received signi cant attention due to their potential applications, such as for selfcleaning,[1] anti-icing,[2] water transportation,[3] and low-drag surfaces.[4]
Anisotropic surfaces are common in nature; for example, on rice leaves, microstructured papillae are arranged parallel to the rice leaf edge, and droplets can roll along a direction parallel to the rice leaf edge and pin along the perpendicular one;[5] the anisotropic structures of butter y wings enable droplets to slide off more along the radial outward direction than along the opposite one.[6]
The wetting behavior of a droplet residing on anisotropic surfaces consisting of chemically-striped patterned surfaces is investigated by numerical methods using Surface Evolver (SE) so ware
Summary
Surfaces with unique wettability have received signi cant attention due to their potential applications, such as for selfcleaning,[1] anti-icing,[2] water transportation,[3] and low-drag surfaces.[4]. A number of experimental studies, typically focusing on the sliding behavior of anisotropic surfaces, have been conducted to understand the dynamic wetting. In order to extend such a 2D model to a 3D one, He et al.[28] used Surface Evolver (SE) to simulate the spreading process of a droplet on anisotropic surfaces, and studied the variations of droplet shape, CA, and dynamic CA (advancing and receding CAs). SE is used to study the wetting behavior of a droplet on anisotropic surfaces with features consisting of stripes with different wettability. The process of experimental measurements of advancing and receding CAs are simulated by changing the droplet volume for each stripe con guration. The minimum advancing CA and the maximum receding CA can be obtained by assigning the zero value to the normalized energy
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
