Hydrophilic Slippery Surface Promotes Efficient Defrosting.

Area of Science:

• Materials Science
• Surface Engineering
• Thermodynamics

Background:

• Frost accretion causes significant energy and economic losses in industrial applications, exemplified by the 2021 Texas power crisis.
• Current frost removal methods using superhydrophobic or lubric surfaces face challenges with cushion instability under extreme conditions.
• Hydrophilic surfaces are traditionally considered unfavorable for frost shedding due to high adhesion.

Purpose of the Study:

• To demonstrate an efficient defrosting method using a combined hydrophilic and slippery surface.
• To investigate the mechanisms behind enhanced frost removal on such engineered surfaces.
• To compare the performance of the novel surface against control surfaces lacking hydrophilicity or slipperiness.

Main Methods:

• Fabrication of a novel surface combining hydrophilic and slippery properties.
• Experimental evaluation of frost accretion and removal dynamics.
• Measurement of substrate-to-frost heat transfer and meltwater retention.
• Comparative analysis of defrosting efficiency and energy consumption against control surfaces.

Main Results:

• The hydrophilic and slippery surface facilitated a highly interconnected basal frost layer, enhancing heat transfer.
• Melted frost readily slid off the surface due to its superb slipperiness, with only 2% retained meltwater.
• Defrosting efficiency was 13 and 19 times higher compared to surfaces lacking hydrophilicity or slipperiness, respectively.
• Energy consumption was 2.3 and 6.2 times lower than control surfaces.

Conclusions:

• A hydrophilic and slippery surface design enables highly efficient frost removal.
• This approach significantly improves heat transfer and reduces meltwater retention.
• The developed surface offers a promising solution for reducing frost-related energy losses in diverse industrial applications.