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서향민(Hyang-Min Seo),박성식(Sung-Seek Park),김남진(Nam-Jin Kim) 대한설비공학회 2010 설비공학 논문집 Vol.22 No.5
In this study, the enhancement of the thermal conductivity of water in the presence of multi-walled carbon nanotubes, MWCNT, was investigated. Sodium Dodecyl Sulfate, SDS, and Polyvinylpyrrolidone, PVP, were employed as the dispersant. SDS or PVP was added in pure water. And then, MWCNT of 0.0005, 0.001, 0.002, 0.003, 0.004, 0.005, 0.01, and 0.02 vol% was dispersed respectively. The thermal conductivity and the viscosity were measured with a transient hot-wire instrument built for this study and the DV II+ Pro viscometer. The results showed that PVP had good thermal conductivity at 300 wt% and this was better than that of SDS 100 wt%, also, the viscosity of nano fluid added PVP rapidly increased until 0.02 vol%.
CSMHYD를 이용한 혼합가스 하이드레이트의 상평형에 대한 연구
서향민(Seo, Hyang-Min),박윤범(Park, Yun-Beom),천원기(Chun, Won-Gee),김남진(Kim, Nam-Jin) 한국신재생에너지학회 2007 한국신재생에너지학회 학술대회논문집 Vol.2007 No.11
Gas hydrate is a special kind of inclusion compound that can be formed by capturing gas molecules to water lattice in high pressure and low temperature conditions. When referred to standard conditions, 1m³ solid hydrates contain up to 172Nm³ of methane gas, depending on the pressure and temperature of production, Such large volumes make natural gas hydrates can be used to store and transport natural gas. In this study, three-phase equilibrium conditions for forming methane hydrate were theoretically obtained in aqueous single electrolyte solution containing 3wt% Nacl. The results show that Nacl acts as a inhibitor, but help gases such as ethan, propane, i-butane, and n-butane reduce the hydrate formation pressure at the same temperature.
Nozzle effect on the formation of Methane hydrate
서향민(Seo, Hyang-Min),박성식(Park, Sung-Seek),김남진(Kim, Nam-Jin) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
When methane hydrate is artificially formed to store and transport large quantity of natural gas, its reaction time may be too long and the gas consumption in water becomes relatively low, the reaction rate between water and methane gas is low. Therefore, the present investigation focuses on the rapid production of hydrates and increases the gas consumption by injecting water into methane gas utilizing nozzle. the hydrate in water injection using a nozzle formed rapidly more than that in gas injection, and the gas consumption of methane hydrate in water injection is about three to four times greater than that in gas injection according to subcooling.
박성식(Park, Sung-Seek),서향민(Seo, Hyang-Min),김남진(Kim, Nam-Jin) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.11
Methane hydrate is crystalline ice-like compounds which formed methane gas enters within water molecules composed cavity at specially temperature and pressure condition, and water molecule and each other from physically-bond. 1m³ hydrate of pure methane can be decomposed to the maximum of 172m³ at standard condition. If these characteristics of hydrate are reversely utilized, natural gas is fixed into water in the form of hydrate solid. Therefore the hydrate is considered to be a great way to transport and store natural gas in large quantity. Especially the transportation cost is known to be 18~24% less than the liquefied transportation. However, when methane hydrate is formed artificially, the amount of consumed gas is relatively low due to a slow reaction rate between water and methane gas. In this study, for the better hydrate reaction rate, there is make nano fluid using ultrasonic dispersion of carbon nano tube. and then, Experiment with hydrate formation by nano fluid and methane gas reaction. The results show that when the carbon nano tubes of 0.004 wt% was added to pure water, the amount of consumed gas was about 300% higher than that in pure water and the hydrate formation time decreased.
중층심해에 분사된 액체 이산화탄소 하이드레이트 용해에 대한 연구
김남진(Kim, Nam-Jin),서향민(Seo, Hyang-Min),박성식(Park, Sung-Seek) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.05
Calculations for the dissolution behavior of liquid CO₂ droplets released in the East Sea and the Clipperton Clarion from a moving ship and a fixed pipeline have been carried out in order to estimate the CO₂ dissolution characteristics in the ocean. The results show that the injection of liquid CO₂ from a moving ship in a high temperature point is an effective method for dissolution. Also, it is noted that the ultimate plume generated from CO₂ bubbles repeatsand shrinking due to the peeling from a fixed pipeline, and the presence of hydrate layer on a liquid CO₂ droplet acts as a resistant layer in dissolving liquid CO₂.
박성식(Park, Sung-Seek),서향민(Seo, Hyang-Min),김남진(Kim, Nam-Jin) 한국신재생에너지학회 2009 한국신재생에너지학회 학술대회논문집 Vol.2009 No.06
가스하이드레이트(Gas Hydrate)는 특정한 온도와 압력조건하에서 물분자로 이루어진 공동 내로 메탄, 에탄, 프로판 등의 가스가 들어가 물분자와 상호 물리적 결합으로 형성된 외관상 얼음과 비슷한 고체 포유물로 자연상태에 존재하는 하이드레이트의 주 성분이 메탄(Methane)인 경우가 대부분인 까닭에 메탄 하이드레이트라고도 불린다. 표준상태에서 1m³의 메탄하이드레이트는 172m³의 메탄가스와 0.8m³의 물로 분해된다. 그러나 메탄 하이드레이트를 인공적으로 만들경우 물과 가스의 반응율이 낮아 하이드레이트 생성시간이 상당히 길고 가스 용해율도 낮다. 따라서 하이드레이트를 빨리 만들며 가스충진율도 증가시킬 수 있는 방법으로 가스 흡착성이 있는 탄소나노튜브(Carbon Nano Tube)를 기계적 분산방법인 초음파 분산(Dispersion)과 화학적 개질에 의한 분산방법인 산화처리분산을 사용하여 탄소나노튜브와 산화탄화나노튜브를 순수한물에 분산하여 나노유체를 만들고, 나노유체와 메탄가스를 반응시켜 메탄하이드레이트를 생성시키는 실험을 수행하였다. 나노유체와 순수한물의 상평형(Phase Equilibrium)은 비슷하였으며, 탄소나노튜브를 0.0005Vol%를 분산한 나노유체와 순수한물의 메탄가스 소모량의 비교한결과 나노유체의 가스소모량의 순수한물보다 {Delta}T_{sub}=0.5K에서는 2배 {Delta}T_{sub}=9.7K에서는 1.6배 증가하였다. 또한 산화나노유체와 나노유체의 메탄 가스소모량은 산화나노유체가 0.01 ~ 0.02mol정도 높았으나 그 효과가 미미하였고, 교반기를 사용하여 RPM300으로 교반시켰을 경우 역시 메탄 가스소모량은 큰 차이가 없었으나 산화나노유체의 경우 메탄 가스소모량이 나노유체보다 급격히 증가함을 확인하였다.
지구온난화 저감을 위한 이산화탄소 하이드레이트 용해거동에 대한 수치적 연구
김남진(Kim, Nam-Jin),서향민(Seo, Hyang-Min),천원기(Chun, Won-Gee) 한국신재생에너지학회 2006 한국신재생에너지학회 학술대회논문집 Vol.2006 No.11
The idea of CO₂ sequestration in the ocean is proposed to be an effective mitigation strategy to counteract potential global warming due to the greenhouse effect Therefore, in the present study, calculations of the dissolution behavior of CO₂ hydrate when liquid carbon dioxide is released at 1,000m and 1,500m in depth are performed. The results show the liquid CO₂ injected in the ocean becomes CO₂ bubble at between 350m and 500m in depth, and the injection from a moving ship is a more effective method of dissolution than through a fixed pipeline. It so also noted that the ultimate plume generated from CO₂ bubbles repeats expansion and shrinking due to the peel ins from a fixed pipeline.
지구온난화 저감을 위한 이산화탄소 하이드레이트 용해거동에 대한 수치적 연구
김남진(Kim, Nam-Jin),서향민(Seo, Hyang-Min),천원기(Chun, Won-Gee) 한국신재생에너지학회 2006 신재생에너지 Vol.2 No.4
The idea of CO₂ sequestration in the ocean is proposed to be an effective mitigation strategy to counteract potential global warming due to the greenhouse effect. Therefore, in the present study, calculations of the dissolution behavior of CO₂ hydrate when liquid carbon dioxide is released at 1,000m and 1,500m in depth are performed. The results show the liquid CO₂ injected in the ocean becomes CO₂ bubble at between 350 m in depth, and the injection from a moving ship is a more effective method of dissolution than through a fixed pipeline. It so also noted that the ultimate plume generated from CO₂ bubbles repeats expansion and shrinking due to the peeling from a fixed pipeline.
중층심해에 분사된 액체 이산화탄소 하이드레이트 용해에 대한 연구
김남진(Kim, Nam-Jin),박성식(Park, Sung-Seek),서향민(Seo, Hyan-Min) 한국신재생에너지학회 2008 신재생에너지 Vol.4 No.2
Calculations for the dissolution behavior of liquid co₂ droplets released in the East Sea and the Clipperton Clarion from a moving ship and a fixed pipeline have been carried out in order to estimate the co₂ dissolution characteristics in the ocean. The results show that the injection of liquid co₂ from a moving ship in a high temperature point is an effective method for dissolution. Also, it is noted that the ultimate plume generated from co₂ bubbles repeatsand shrinking due to the peeling from a fixed pipeline, and the presence of hydrate layer on a liquid co₂ droplet acts as a resistant layer in dissolving liquid co₂.