산질화 표면에서의 액적 증발 열전달 성능 분석

• Published in: 한국분무공학회지 Vol. 24; no. 4; pp. 203 - 208
• Main Authors: 김대윤, Dae Yun Kim, 이성혁, Seong Hyuk Lee
• Format: Journal Article
• Language: Korean
• Published: 한국분무공학회 31.12.2019
• Subjects: Corrosion resistance; Droplet evaporation; Heat transfer; Oxi-nitriding; Thermal resistance; 기계공학; 내부식성; 산질화; 액적 증발; 열저항; 열전달
• ISSN: 1226-2277; 2288-9051
• DOI: 10.15435/JILASSKR.2019.24.4.203

In general, the oxi-nitriding method is well known as such a surface treatment way for substantial enhancement in corrosion resistance, even comparable to that of titanium. However, there are still lacks of information on thermal performance of the oxi-nitriding surface being of additional compound layers on the base substrate. Above all, the quantitative measurement of its thermal performance still was not evaluated yet. Thus, the present study experimentally measures the thermal resistance of the oxi-nitriding surface during droplet evaporation and then estimates heat transfer performance with the use of the onedimensional heat transfer model in vertical direction. From the experimental results, it is found that the total evaporation time slightly increased with the thermal resistance caused by the oxi-nitriding layer, showing a maximum difference of approximately 20% with that of the bare surface. Although the heat transfer performance of oxi-nitriding surface became slightly lower than that of the bare surface, the oxi-nitriding surface exhibits much better heat transfer performance compared to titanium.