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한경완(Kyeongwan Han),배기창(Kichang Bae),이정훈(Junghoon Lee) 한국표면공학회 2023 한국표면공학회지 Vol.56 No.1
Lubricant-impregnated nanoporous surfaces (LIS), which is created by impregnating water-immiscible oil into nanoporous surface structure, have been explored considering wide range of application fields. Due to the lubricant impregnated in nanoporous structure, the surface shows extreme de-wetting with a high mobility of water droplets, so that various functionalities can be realized. The lubricant layer inhibits the contact of corrosive media to porous structure as well as metal substrate, thus the surface improves the corrosion resistance. The water on the surface freeze without any contact to solid porous structure, showing a low ice adhesion for de-icing an anti-icing. The extremely high mobility of water droplets on lubricant-impregnated porous surfaces also contributes the enhancement of condensation heat transfer as well as water harvesting from fog and moisture. Moreover, the bacteria adhesion on metal surface forming biofilms causing serious hygiene issues can be inhibited on the lubricantimpregnated surfaces. Despite of such superior functionalities, the lubricant-impregnated porous surface has a limitation of lubricant depletion by external flow of fluids. Therefore, extensive efforts to improve the durability of lubricant-impregnated surface are required for practical applications.
Syaiful,Myung-whan Bae,Kichang Im 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Selective catalytic reduction (SCR) is a successful technique to reduce NO<SUB>x</SUB> emissions in diesel exhaust gases. The aim of current study is to develop a SCR catalytic filter device for reducing NO<SUB>x</SUB> and soot emissions simultaneously in diesel combustors. SCR catalysts are used to reduce NO<SUB>x</SUB> emissions, and the novel catalytic filters inside SCR system are especially designed and manufactured to reduce soot particles. NH₃ or urea (which is converted to ammonia) is injected into exhaust stream then reacts with NO<SUB>x</SUB> emissions over the catalyst surface of SCR device, so that a uniform distribution of NH₃ is one of the challenges in the novel design of SCR device in order to attain NO<SUB>x</SUB> conversion and reduce NH₃ slip optimally. In this study, three catalytic filters with 120° interval are vertically mounted under the horizontal plate. Ammonia is injected radially perpendicular into the inlet main flow. The ammonia concentration in the SCR catalytic filter device is investigated by numerical simulation. Gaseous flow in SCR catalytic filter device is modeled as laminar and turbulent flow by varying the Reynolds numbers. The results show that there is the small influence of circulations on the ammonia concentration near the inlet domain at the low Reynolds number. On the contrary, the high influence of circulations on the ammonia concentration is observed at high Reynolds number.