Dynamic Brush Surface Inducing Mobile Crystallization for Sustainable Spray Cooling Using Saline.

Area of Science:

• Materials Science
• Chemical Engineering
• Heat Transfer

Background:

• Spray cooling is an effective heat dissipation method.
• Global water scarcity drives interest in using seawater for cooling.
• Salt accumulation on surfaces hinders seawater-based spray cooling efficiency.

Purpose of the Study:

• To develop a surface coating that mitigates salt accumulation during seawater spray cooling.
• To demonstrate the efficacy of a dynamic polymer brush coating in regulating salt crystallization.
• To enable the sustainable use of seawater in industrial cooling applications.

Main Methods:

• Development of a liquid-like polymer brush coating.
• Grafting polydimethylsiloxane brushes onto aluminum alloy (PBGAA) as a proof-of-concept.
• Testing PBGAA performance in continuous seawater spray cooling against a control surface (AA).

Main Results:

• PBGAA maintained a stable temperature drop (67.9 to 55.4 °C) over 2 hours.
• The control surface (AA) showed a temperature rise (67.9 to 75.9 °C).
• PBGAA exhibited minimal weight gain (0.015 g) compared to significant gain on AA (1.242 g).

Conclusions:

• The dynamic polymer brush coating effectively regulates salt crystallization and facilitates detachment.
• This strategy significantly enhances the performance and durability of surfaces under seawater spray cooling.
• The brush-grafting approach shows high potential for industrial seawater cooling applications.