Condensation Heat Transfer Correlation for Micro/Nanostructure Properties of Surfaces

Shin, Younghun; Jeong, Subin; Lee, Kwon-Yeong; Woo, Seeun; Hwang, Woonbong

doi:10.1021/acsomega.2c02557

Cited by 6 publications

(2 citation statements)

References 34 publications

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“…For a Reynolds number of 10,000, the saturation pressure was increased incrementally from 0.2 bar to 0.6 bar, assigning Conditions 1 through 3 for each 0.2 bar interval. Once the saturation pressure reached 0.6 bar, the supersaturation level was elevated by adjusting the Reynolds number to 20,000 (Condition 4), followed by a decrease in saturation pressure to 0.4 bar (Condition 5) [29].…”

Section: Experimental Conditions For Condensing Performance Evaluationmentioning

confidence: 99%

Scalable micro/nanostructured superhydrophobic surface modifications for enhanced energy efficiency and heat transfer performance in stainless steel and titanium

Shin

Lee

et al. 2023

Mater. Res. Express

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Condensation refers to the change of a substance from a gaseous phase to a liquid phase, an example of which is the condensation of water vapor in nature. Condensation is used in many industries, such as energy generation and seawater desalination. On a general surface, filmwise condensation is the main phenomenon in which gaseous water vapor is condensed in the form of a film. However, film condensation acts as a factor that reduces energy efficiency as the liquid film formed on the surface interferes with heat transfer. A phenomenon opposite to film condensation is dropwise condensation, which is immediately separated after condensation in the form of droplets, and thus a film is not formed, greatly improving heat transfer efficiency. Because of these advantages, many studies have been conducted, and most studies have induced dropwise condensation by modifying the surface to be superhydrophobic. However, in the case of a superhydrophobic surface, it takes a lot of time and money in the process, so there is a great difficulty in increasing the area. Among them, stainless and titanium, which are most materials for industrial heat exchangers, have high robustness, so there are few studies on improving the condensation performance after surface modification due to the difficulty of processing. For this reason, there is a large gap between the currently conducted studies and the actual industry. Our research team succeeded in modifying the surface of a stainless steel and titanium tube the size of an actual heat exchanger into superhydrophobicity with a simple process. We confirmed that the condensation performance was improved on the superhydrophobic surface through experiments under various conditions. By comparing the improvement in the heat transfer performance of stainless steel and titanium under several conditions, the main cause of the performance improvement was proved. This study is expected to play a major role in the eco-friendly future industry where energy efficiency is important by improving the heat transfer performance of stainless and titanium, which are mainly used throughout the industry.

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Section: Experimental Conditions For Condensing Performance Evaluationmentioning

confidence: 99%

Scalable micro/nanostructured superhydrophobic surface modifications for enhanced energy efficiency and heat transfer performance in stainless steel and titanium

Shin

Lee

et al. 2023

Mater. Res. Express

Self Cite

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“…In recent decades, people have become more and more familiar with micro-nano structural materials. It is found that micro-and nanomaterials have excellent hydrophobicity [68,69], high thermal conductivity [70], self-healing characteristics [71], biodegradability and compatibility [72,73], and have been applied to fields such as chemical coatings [74,75], biomedical devices [76,77], food safety [78,79], and photoelectric device manufacturing [80][81][82]. The combination of wood superhydrophobic coating and micronano particles effectively links the latest technology of micro-nano structure and green materials, with wide space for development.…”

Section: Introductionmentioning

confidence: 99%

Advances in Sol-Gel-Based Superhydrophobic Coatings for Wood: A Review

Wang,

Ge-Zhang,

et al. 2023

IJMS

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As the focus of architecture, furniture, and other fields, wood has attracted extensive attention for its many advantages, such as environmental friendliness and excellent mechanical properties. Inspired by the wetting model of natural lotus leaves, researchers prepared superhydrophobic coatings with strong mechanical properties and good durability on the modified wood surface. The prepared superhydrophobic coating has achieved functions such as oil-water separation and self-cleaning. At present, some methods such as the sol-gel method, the etching method, graft copolymerization, and the layer-by-layer self-assembly method can be used to prepare superhydrophobic surfaces, which are widely used in biology, the textile industry, national defense, the military industry, and many other fields. However, most methods for preparing superhydrophobic coatings on wood surfaces are limited by reaction conditions and process control, with low coating preparation efficiency and insufficiently fine nanostructures. The sol-gel process is suitable for large-scale industrial production due to its simple preparation method, easy process control, and low cost. In this paper, the research progress on wood superhydrophobic coatings is summarized. Taking the sol-gel method with silicide as an example, the preparation methods of superhydrophobic coatings on wood surfaces under different acid-base catalysis processes are discussed in detail. The latest progress in the preparation of superhydrophobic coatings by the sol-gel method at home and abroad is reviewed, and the future development of superhydrophobic surfaces is prospected.

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Experimental study of two-phase closed thermosyphon with super-hydrophilic and super-hydrophobic surfaces

Seo,

Sun,

Shin

et al. 2024

J Mech Sci Technol

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Condensation Heat Transfer Correlation for Micro/Nanostructure Properties of Surfaces

Cited by 6 publications

References 34 publications

Scalable micro/nanostructured superhydrophobic surface modifications for enhanced energy efficiency and heat transfer performance in stainless steel and titanium

Scalable micro/nanostructured superhydrophobic surface modifications for enhanced energy efficiency and heat transfer performance in stainless steel and titanium

Advances in Sol-Gel-Based Superhydrophobic Coatings for Wood: A Review

Experimental study of two-phase closed thermosyphon with super-hydrophilic and super-hydrophobic surfaces

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