Collapse Behavior of Saltwater Droplets during Icing on Solid Surfaces.

Area of Science:

• Materials Science
• Fluid Dynamics
• Thermodynamics

Background:

• Saltwater droplet icing on surfaces is prevalent in nature and industry, impacting structural safety and freeze desalination.
• Understanding the complex heat and mass transfer during icing is crucial for technological advancements.

Purpose of the Study:

• To experimentally investigate the collapse phenomena of saltwater droplets during icing on solid surfaces.
• To identify and classify collapse patterns, elucidate mechanisms, and explore the relationship with surface thermal conductivity.

Main Methods:

• Experimental investigation of saltwater droplet icing on surfaces under oversaturated ambient air conditions.
• Classification of observed collapse patterns and analysis of their underlying mechanisms.
• Correlation of collapse behavior with surface thermal conductivity.

Main Results:

• Three representative saltwater droplet collapse patterns during icing were identified and classified.
• Surface thermal conductivity significantly influences collapse behavior; low conductivity surfaces exhibit more complex patterns.
• Spontaneous nucleation-recalescence on low conductivity surfaces leads to vapor release, promoting frost growth or condensation, ultimately causing collapse.

Conclusions:

• Collapse behaviors accelerate ice accumulation and degrade superhydrophobic coatings.
• Findings enhance the understanding of saltwater droplet icing dynamics.
• Insights provided for designing improved freeze desalination systems and anti-icing technologies.