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Effect of Surface Structure Complexity on Interfacial Droplet Behavior of Superhydrophobic Titanium Surfaces for Robust Dropwise Condensation

In general, the dropwise condensation supported by superhydrophobic surfaces results in enhanced heat transfer relative to condensation on normal surfaces. However, in supersaturated environments that exceed a certain supersaturation threshold, moisture penetrates the surface structures and results in attached condensation, which reduces the condensation heat transfer efficiency. Therefore, when designing superhydrophobic surfaces for condensers, the surface structure must be resistant to attached condensation in supersaturated conditions. The gap size and complexity of the micro/nanoscale surface structure are the main factors that can be controlled to maintain water repellency in supersaturated environments. In this study, the condensation heat exchange performance was characterized for three different superhydrophobic titanium surface structures via droplet behavior (DB) mapping to evaluate their suitability for power plant condensers. In addition, it was demonstrated that increasing the surface structure complexity increases the versatility of the titanium surfaces by extending the window for improved heat exchange performance. This study demonstrates the usefulness of DB mapping for evaluating the performance of superhydrophobic surfaces regarding their applicability for industrial condenser systems.
- Daegu Gyeongbuk Institute of Science and Technology Korea (Republic of)
- Halla University Korea (Republic of)
- Chosun University Korea (Republic of)
- Hallym University Korea (Republic of)
- DGIST (대구경북과학기술원) Korea (Republic of)
Technology, Superhydrophobicity, Condensation, Heat exchangers, condensation heat transfer, ENERGY, Power plant condensers, micro-nanostructure, HEAT-TRANSFER, Heat transfer, Surface properties, Droplet behavior, superhydrophobic surface, SIMPLE FABRICATION, WETTABILITY, Titanium, Microscopy, QC120-168.85, T, Superhydrophobic surface, 600, ALUMINUM, Dropwise condensation, Engineering (General). Civil engineering (General), Mapping, ENHANCED CONDENSATION, Drops, Electrical engineering. Electronics. Nuclear engineering, TA1-2040, Titanium surfaces, Article, Super-hydrophobic surfaces, Heat exchange performance, Condensation heat transfer, STEAM, QH201-278.5, Surface structure, dropwise condensation, 540, Structure complexity, 620, TRANSPARENT, TK1-9971, Enhanced heat transfer, Energy efficiency, Descriptive and experimental mechanics, TUBE, droplet behavior, Micro-nanostructure
Technology, Superhydrophobicity, Condensation, Heat exchangers, condensation heat transfer, ENERGY, Power plant condensers, micro-nanostructure, HEAT-TRANSFER, Heat transfer, Surface properties, Droplet behavior, superhydrophobic surface, SIMPLE FABRICATION, WETTABILITY, Titanium, Microscopy, QC120-168.85, T, Superhydrophobic surface, 600, ALUMINUM, Dropwise condensation, Engineering (General). Civil engineering (General), Mapping, ENHANCED CONDENSATION, Drops, Electrical engineering. Electronics. Nuclear engineering, TA1-2040, Titanium surfaces, Article, Super-hydrophobic surfaces, Heat exchange performance, Condensation heat transfer, STEAM, QH201-278.5, Surface structure, dropwise condensation, 540, Structure complexity, 620, TRANSPARENT, TK1-9971, Enhanced heat transfer, Energy efficiency, Descriptive and experimental mechanics, TUBE, droplet behavior, Micro-nanostructure
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