Droplet Impact on Superhydrophobic Mesh Surfaces.

Area of Science:

• Fluid Dynamics
• Surface Science
• Materials Science

Background:

• Reducing droplet impact contact time is vital for applications like anti-icing and corrosion prevention.
• Existing methods often struggle with position sensitivity and limited effectiveness.

Purpose of the Study:

• To explore a novel superhydrophobic mesh surface for reducing droplet impact contact time.
• To investigate the influence of impact Weber numbers and ridge spacing on droplet dynamics.
• To minimize the effect of impacting location on contact time reduction.

Main Methods:

• Experimental investigation of droplet impacts on superhydrophobic mesh surfaces with perpendicular ridges.
• Analysis of impact dynamics, contact time, Weber numbers, and ridge spacing.
• Theoretical proposal of criteria for splashing and pancake bouncing.

Main Results:

• Superhydrophobic mesh ridges segment liquid films into retracting subunits, reducing contact time.
• Contact time showed negligible sensitivity to impacting position, with reductions up to 68%.
• Theoretical criteria for splashing and pancake bouncing were established.

Conclusions:

• The novel superhydrophobic mesh surface effectively reduces droplet impact contact time.
• The mechanism involves liquid film segmentation and upward driving force from retracting subunits.
• Provides design guidelines for enhanced droplet impact management on superhydrophobic surfaces.