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호흡식 분말의약품 제조용 분무동결건조기 설계에 관한 연구
박성제(S.J. Park),송치성(C.S. Song),한용식(Y.S. Han),김재형(J.H. Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.11
This paper shows the study on the design of the spray-freeze dryer for the production of the pulmonary inhalation powders. Powder production and handling has been an integral part of pharmaceutical processing because of the wide use of oral dosage forms. There are a few commonly used powder preparation methods including mechanical milling, precipitaion, spray drying, freeze drying, and so on. In general, methods available for preparing inhalation powders are limited due to certain inhalation powder's sensitive nature to the processing environments. This is particularly true for preparing dry powder aerosols where the aerodynamic particle size(<5μm) and the size distribution are pivotal. Supercritical fluid antisolvent and spray freeze drying have recently emerged as promising techniques for producing powders for use in microcapsulation. However, the aerosol applications of these powders are yet to be explored. The purpose of this study is to test the feasibility of using spray freeze-dried pulmonary inhalation powders for aerosolization.
정인수(I. S. Jung),이영규(Y. G. Lee),한용식(Y. S. Han),김종진(J. J. Kim),정희택(H. T. Chung) 한국동력기계공학회 2008 한국동력기계공학회 학술대회 논문집 Vol.2008 No.11
In the present study, the numerical simulation has been performed to predict the performance of the fire suppression system for cabin of shipboard enclosure. The open numerical code was used for the present simulation named as FDS(Fir Dynamic Simulator). Application has been done to predict the interaction between water mist and fire plume. In this study, the passenger cabin was chosen as simulation space. The computational domains for simulation in the passenger cabin were considered the fire scenario of IMO rules. The full scale of the flow field is W×L×H=4×3×2.4 ㎥ with a dead zone of W×L×H=1.22×1.1×2.4 ㎥. The water mist nozzle is installed in ceiling center or z.3m height from the floor, and there are six mattresses and four cushions in the simulation space. The five types of nozzle cluster were simulated in the study. Numerical results showed that C2-type is the most effective on fire suppressing.
정인수(I.S. Jung),정희택(H.T. Chung),한용식(Y.S. Han) 한국전산유체공학회 2016 한국전산유체공학회지 Vol.21 No.4
The numerical simulation has been performed to predict the performance of the fire suppression system for cabin of shipboard enclosure. The present study aims ultimately at finding the optimal parametric conditions of the mist-injecting nozzles using the CFD methods. The open numerical code was used for the present simulation named as FDS (Fire Dynamics Simulator). Application has been done to predict the interaction between water mist and fire plume. In this study, the passenger cabin was chosen as simulation space. The computational domains for simulation in the passenger cabin were determined following the fire scenario of IMO rules. The full scale of the flow field is W×L×H=4×3×2.4 m³ with a dead zone of W×L×H=1.22×1.1×2.4 m³. The water mist nozzle is installed in ceiling center of 2.3 m height from the floor, and there are six mattresses and four cushions in the simulation space. The combination patterns of orifices to the main nozzle and the position to install nozzles were chosen as the simulation parameters for design applications. From the present numerical results, the centered-located nozzles having evenly combined orifices were shown as the best performance of fire suppression.
소화노즐의 분무특성에 대한 설계 변수 영향의 수치해석적 연구
이창효(C. H. Lee),정희택(H. T. Chung),한용식(Y. S. Han),김창(C. Kim) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Numierical investigation has been performaed to simulate the spray characteristics in mist-spray fire suppression nozzles in sense of design parameters. Three key shape factors in nozzle orifices. I.e. diameter, length and exit shape are chosen as simulation parameters. Fluent with the proper modeling was applied as numerical tools. Spray angles, drop size, and jet velocitys are analyzed for each parameters to find the optimal design conditions.
미분무수 소화 노즐의 분무 특성 예측을 위한 CFD기법의 적용
정희택(H.T. Chung),이창효(C.H. Lee),최병일(B.I. Choi),한용식(Y.S. Han),옥영욱(Y.W. Ock) 한국전산유체공학회 2006 한국전산유체공학회지 Vol.11 No.4
Numerical simulation has been performed to investigate the characteristics of the mist flow through the fire suppression nozzles. The commercial CFD software, FLUENT with the proper modeling was applied for analyzing both the internal and external flow of the spray nozzles. Computations were made for the full cone nozzle in the operation range of the low pressure and high flow-rate. To validate the present computational procedure, numerical results are compared with measurements in terms of K-factor, SMD, axial spray velocity and spray angles. Numerical results suggested that the present numerical model can be used as an adequate tool for a design purpose of mist-spray nozzles.
김태권(T.K.Kim),이장희(J.H.Lee),김병연(B.Y.Kim),한용식(Y.S.Han) 한국자동차공학회 1993 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
An experimental investigation was carried out to study injection characteristics of an electronically controlled low pressure valve for hydrogen fueled engine. A low pressure injection valve and an operation circuit for electronic control were designed and manufactured. Hydrogen injection pressure was measured to elucidate the poppet valve behavior. A spark shadowgraphy was employed using injector trigger pulse and time delay circuit, to clarify the injection valve mechanism.<br/>
미분무수 소화시스템의 분무 및 소화 특성 예측을 위한 유동장 수치 시뮬레이션
이창효(C. H. Lee),정희택(H. T. Chung),최병일(B. I. Choi),한용식(Y. S. Han),옥영욱(Y. W. Ok) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
In the present study, numerical simulation has been performed to investigate the characteristics of the mist flow through the fire suppression nozzles and influence of water mist on fire suppression mechanism. The commercial CFD software, FLUENT with the proper modeling was applied in both the internal and external flow region of the spray nozzle. Numerical validation was proved by the comparison of the experimental data in the cold condition. The effect of the heat source on the flow fileds in the spray region were computed for the design purpose.