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Chee Burm Shin,Wonjin Jeon,Jong Ho Kim,곽병규,이종협,Jun Hee Lee,Woon Gi Lee,Sun Woo Lee,Hyeon Soo Park 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.6
The environmental contamination problems caused by accelerated industrialization are becoming increasingly important issues. It is necessary to estimate the distributions of the contaminants and to recognize the risks to our environment. The behavior of volatile organic compounds (VOC) can be analyzed with the concept of fugacity. However, it is difficult to simulate the fate of heavy metals with this concept, because their vapor pressure is extremely small or unknown. Therefore, the aquivalence (from “equivalent aqueous”) theory, which was derived from the fugacity theory, is utilized to establish a mathematical model and to analyze the fate of heavy metals in an urban multimedia system. The target heavy metal is lead and the target region is around Jungrang stream in Seoul. The multimedia is composed of air, water, sediment, soil and vegetation. To verify the proposed mathematical model, the modeling results were compared with the measurement data obtained from the Korea Testing and Research Institute.
신치범,이상덕,Berezhnoj,Stas 한국화학공학회 2001 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.39 No.1
고밀도 플라즈마 발생장치의 해석을 위하여 2차원 유체 모델링을 수행하였다. 모델에서는 플라즈마 전달현상, 중성입자 동력학, 기체 유동, 열전달 및 외부로부터 공급되는 동력의 영향이 모두 포함되었다. 다성분계의 전달 현상에 대한 지배방정식은 유도 결합 동력의 분포를 구하기 위한 Maxwell 방정식과 연립하여 해를 구하였다. 이 모델을 헬리컬 공진기 염소 플라즈마 발생장치에 적용하여 반응기 압력, 기체 유량 및 공급된 동력이 플라즈마 밀도 및 전자 온도에 미치는 영향을 검토하였다. A two-dimensional fluid modeling was performed for the analysis of the high-density plasma source. The model coupled plasma transport, neutral species dynamics, gas flow, heat transfer, and plasma power coupling from an external source. The governing equations for multicomponent transport system were solved along with Maxwell's equations for inductively coupled power deposition. The model was applied to a chlorine discharge in the plasma source chamber of helical resonator. The effects of reactor pressure, gas flow rate, and deposited power on the plasma density and the electron temperature were examined.
신치범,박성용,양철남,윤창연,Berezhnoj,S . V . 한국화학공학회 2000 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.38 No.5
전기자동차용 축전지의 다양한 작동조건, 주변환경 및 설계인자들이 축전지의 열적 거동에 미치는 영향을 예측하기 위한 3차원 모델링을 수행하였다. 축전지의 열전도도는 각종 구성요소의 열전도저항이 직렬 및 병렬로 연결된 것으로 간주하였으며, 전극내에서 열이 균일하게 발생하는 것으로 가정하여 축전지의 열적 특성을 해석하였다. 작동 조건에 따른 최대 온도를 제시함으로써 축전지가 작동한계온도 범위 내에서 작동할 수 있는지를 판단할 수 있도록 하였다. 또한, 축전지의 특정부분의 표면온도를 측정하는 것만으로 내부의 최고 온도 예측을 가능하게 함으로써 축전지를 제어할 수 있는 기초자료로 사용할 수 있게 하였다. 본 연구의 결과는 전기자동차용 축전지의 최적 열관리 기술 개발에 효과적으로 활용될 수 있다. A three-dimensional modeling was carried out to investigate the effects of operating conditions, ambient conditions, and design factors on the thermal behavior of an electric-vehicle(EV) battery. Thermal conductivities of various compartments of the battery were estimated based on the equivalent network of parallel/series thermal resistances of battery components. Heat generation rate was assumed to be uniform throughout battery electrodes. The maximal temperatures within the battery at various operating conditions were calculated in order to check whether the operating temperature of the battery is within acceptable range. In addition, the relation between the surface temperature of the specific region and the maximal temperature of the battery interior was obtained so that the measurement of the surface temperature may be used to predict the maximal temperature of the interior. The results of this study may be useful for the optimal design of the thermal management system of an EV battery.
Polyvanadate dominant vanadia–alumina composite aerogels prepared by a non-alkoxide sol–gel method
Choi, Jinsoon,Shin, Chee Burm,Suh, Dong Jin Royal Society of Chemistry 2009 Journal of materials chemistry Vol.19 No.41
<P>Vanadia–alumina composite aerogels were synthesized by a cogelation method using alcoholic solutions of metal chlorides under acidic conditions. The resulting aerogels exhibited high surface areas and narrow pore size distributions in the mesoporous region. The vanadium oxides existing on the surface of the aerogels predominantly developed into polyvanadates in terms of chemical structure following the introduction of V species up to 40 wt.% with 500 °C calcination. The intensities of the Raman spectra for the polyvanadates increased with vanadia content, while Raman bands shifted towards lower wavenumbers with decreasing vanadia content due to weak V–O bonds. Homogeneity of the surface vanadates on the aerogels was much higher than that on the impregnated materials, as observed in temperature programmed reduction and NH<SUB>3</SUB> temperature programmed desorption patterns.</P> <P>Graphic Abstract</P><P>Vanadia–alumina composite aerogels were synthesized by a cogelation method using alcoholic solutions of metal chlorides under acidic conditions and subsequent supercritical drying. The vanadium oxides existing on the surface of the aerogels predominantly developed into polyvanadates in terms of chemical structure following the introduction of V species up to 40 wt.% with 500 °C calcination. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b905435a'> </P>
Yi, Jaeshin,Koo, Boram,Shin, Chee Burm,Han, Taeyoung,Park, Seongyong Pergamon Press 2017 Computers & chemical engineering Vol.99 No.-
<P><B>Abstract</B></P> <P>This paper reports a two-dimensional modeling to predict the aging effect on the variation of the electrical and thermal behaviors of a lithium-ion battery (LIB) cell under the constant current (CC) charge and discharge cycling over a long time. To account for the aging effects of the LIB cell due to cycling, the key modeling parameters are expressed as a function of cycling number. In order to validate the modeling methodology introduced in this paper, the modeling results towards the changes of the discharge curves and two-dimensional temperature distributions of the aged LIB cell during CC discharge at different C rates are compared with the experimental measurements after every thousand cycles. The electrical and thermal behaviors predicted by the modeling for the aged LIB cell show good agreement with the experimental data.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Aging effects on the performance of a lithium-ion battery are modeled during cycling. </LI> <LI> Key modeling parameters are expressed as a function of cycle number for aging effects. </LI> <LI> Cycling tests are performed under the constant current charge and discharge cycles. </LI> <LI> Modeling approach is validated by comparing modeling results with experimental data. </LI> <LI> Modeling results for aging effects agree well with cycling test data. </LI> </UL> </P>
이종대,신치범 한국화학공학회 1993 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.31 No.5
가우스분포를 갖는 레이저광이 조사될 때, 광기록매체에서의 열적 특성을 유한요소법을 사용하여 연구하였다. 레이저광이 조사되는 정지된 기록매체에서, power가 증가할수록 또는 필름층의 두께가 감소할수록 기록매체내의 최고온도는 증가했으며, 레이저가 조사되어 100 ns 지난 후에 열적 평형상태에 도달함을 알 수 있었다. 또한 일정 선형속도로 움직이는 기록매체에서 눈물방울 형상의 pit가 형성될 수 있음을 예측하였다. Thermal characteristics of optical recording media were investigated using the finite element method when a laser beam with a Gaussian distribution was incident on it. For a stationary media, it was found that the maximum temperature increased with increasing laser power and decreasing film thickness. Thermal equilibrium state was reached in 100 ns after the laser was turned on. In addition, in the recording media moving with a constant linear velocity, it was possible to predict the formation of teardrop-shaped pit.