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Visualization of High Speed Liquid Jet Impaction on a Moving Surface

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Published on: April 17, 2015

Characterization of rough surfaces with vibrated drops.

Edward Bormashenko¹, Roman Pogreb, Tamir Stein

¹Ariel University Center of Samaria, Applied Physics Faculty, Ariel, Israel.

Physical Chemistry Chemical Physics : PCCP

|July 4, 2008

Summary

Vertically-vibrated drops on rough surfaces exhibit alternative wetting transition pathways. Multiple Gibbs free energy minima explain these pathways, influenced by vibration forces and pressure acting on the triple line.

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Area of Science:

Physics
Materials Science
Surface Science

Background:

Understanding wetting phenomena on rough surfaces is crucial for various applications.
Previous models often simplify the complex interactions governing liquid behavior on textured substrates.

Purpose of the Study:

To investigate wetting transitions on rough substrates under vertical vibration.
To model and explain the observed alternative pathways of wetting transitions.
To identify the key forces driving these transitions.

Main Methods:

Experimental study of liquid drops on artificial and natural rough substrates.
Application of controlled vertical vibrations to the substrates.
Analysis of wetting states including Cassie impregnating and Wenzel states.

Main Results:

Observed alternative pathways for wetting transitions on rough surfaces.
Developed a model based on multiple Gibbs free energy minima to explain these pathways.
Demonstrated that vibration, Laplace, and hydrostatic pressure acting on the triple line trigger wetting transitions.

Conclusions:

The final wetting states are primarily the Cassie impregnating or Wenzel states.
The substrate ahead of the droplet remains dry, indicating localized wetting.
The presented model provides a comprehensive understanding of wetting dynamics on vibrated rough surfaces.