Superwettability controlled overflow

A study was conducted to propose an effective strategy to control overflow behavior based on surface superwettabilities. It was demonstrated that micro-nanostructured superhydrophilic surfaces could enhance overflow and micro-nanostructured superhydrophobic surfaces could reduce overflow behavior. The fundamental mechanism for the dynamic interaction between fluids and solid edges were revealed and several methods for preparing surfaces of solid edges with superwettabilities were developed. A simple experimental setup was designed to investigate overflow behaviors in an upward direction with varying flow rates. The experimental setup was based on an aluminum plate with a round margin whose radius of curvature (RoC) was varied between 5.0 and 30.0 mm.