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띠형 물체의 기력수송(氣力輸送)을 위한 부하한계식(負荷限界式)
이춘식,Lee, Chun Sik 대한설비공학회 1988 설비저널 Vol.17 No.4
Pneumatic transportation systems are operated most economically, if the transportation velocity is somewhat greater than the limit velocity. Therefore it is very important to find out this limit velocity. That is well known for coarse and fine particles, but not yet for long ribbon type material. In this study a formula for the mass ratio of transported material to air in limit load point is derived for ribbon type material from the pneumatic transportation theory and the model theory. A relationship for estimating the limit velocity is also found out through experiments. The possibility of the generalization of this formula, which is obtained from a given pneumatic transportation system, should be estimated through further systematic studies.
분자동역학을 이용한 나노채널내에서의 나노유체의 혼합유동
이춘식(Chun-Sik Lee),김윤호(Yoon-Ho Kim),이규정(Kyu-Jung Lee) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
In this study, We simulate mixing phenomena by collision of two nanofluids in very narrow solid channel which has a Face-Centered-Cubic(FCC) structure. It is not trivial to transport fluids around inside the Nano-Electro-Mechanical- Systems(NEMS) such as biofluidic chips. Also, reactive fluids must be brought together and mixed. We do this by performing molecular dynamics simulation and we find the fact that mixing efficiency is largely dependent to convective velocity of fluid and channel temperature.
나노직관채널 형상에 따른 나노유체의 혼합 및 열전달 특성연구
이춘식(Chun-Sik Lee),서장원(Jang-Won Seo),이규정(Kyu-Jung Lee) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
In this study the mixing and heat transfer characteristics of nanofluids are simulated in straight channels which have the periodic obstacles. Several geometric configurations are adopted to find the effects of the width and height of obstacle. Also local temperature distribution is investigated in vertical direction of the channel. So, we use a classical MD simulation and consider the intermolecular force not only among fluid molecules but also between the fluid atoms and the solid wall particles. As a result, it is founded that mixing efficiency and temperature variation is strongly dependent on obstacle shapes.
COVID19 팬더믹 전후 소각장 반입 생활폐기물의 물리·화학적 특성
이춘식 ( Chun-sik Lee ),류재용 ( Jae Yong Ryu ) 한국환경기술학회 2022 한국환경기술학회지 Vol.23 No.6
For 8 years before and after COVID19 in H-gun, a small and medium-sized rural city, a quarterly survey and analysis was conducted on changes in physical and chemical characteristics of domestic waste brought into the domestic waste incinerator input. Apparent density, three-component, and elemental analysis were performed, and based on this, the calorific value of waste to be recycled was calculated. Through this, the following results were obtained about the characteristics of household waste generation in rural small and medium-sized cities before and after the COVID19 pandemic. First, since the COVID19 pandemic in the fourth quarter of 2019, the content of plastics and fibers has increased relatively, and this reason is judged to be the result of the increase in the use of plastic packaging materials and masks. Second, in the case of moisture content and combustible content before and after COVID19, a decrease in moisture content and an increase in combustible content were evident overall, except for the quarter of a specific year. Third, comparing the low calorific value before and after COVID19, it was higher than about 3,000 kcal/kg from the fourth quarter of 2019, except for 2016, after the COVID19 pandemic.