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입자의 실시간 관측 및 포집이 가능한 임팩터의 설계 및 성능해석
육세진(Se-Jin Yook),안강호(Kang-Ho Ahn) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.5
Recently consideration of health and interest on bio aerosols have been growing steadily. In this study,<br/> inertial impactor, which can be used to collect airborne particles and bio aerosols, was newly devised for realtime<br/> observation on the particles collected on impaction plate, and named Visual Impactor. The Visual<br/> Impactor was used to collect airborne particles, and the features of particles collected on the impaction plate<br/> could be seen in real-time. Airborne particles in different weather conditions (fine, cloudy, and rainy) were<br/> sampled and compared one another. Features of collected airborne particles were dependent strongly upon<br/> relative humidity of the ambient air. In addition, with hours elapsing, shapes and colors of collected airborne<br/> particles were changed by evaporation and surface tension, etc.
지하터널에서 주행하는 전동차의 하부에서 발생한 입자의 이동경로 예측
이경란,김원근,육세진,우상희,김종범,배귀남,박형구,윤화현 한국입자에어로졸학회 2015 Particle and Aerosol Research Vol.11 No.1
In this study, the flow around a subway train running in an underground tunnel was numerically estimated. For the validation of the numerical results, the airflow velocity at a point underneath a subway train was measured using an ultrasonic anemometer. Then, the trajectories of particles generated at the contact points between the wheels and rails were numerically predicted. By considering the airflow velocity and particle trajectories, the space underneath the T-Car (trailer car) was expected to be appropriate for the room for the installation of a dust-removal system.
이한돌,육세진,한석영 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.7
The deposition velocity is used to assess the degree of particulate contamination of wafers or photomasks. A numerical model was developed to predict the deposition velocity under the combined influences of thermophoresis and electrophoresis. The deposition velocity onto a face-up flat plate in parallel airflow was simulated by varying the temperature difference between the plate’s surface and ambient air or by changing the strength of the electric field established above the plate. Both attraction and repulsion by thermophoresis or electrophoresis were considered. When the plate’s surface was colder than ambient air, the surface of the face-up plate could be at risk of contamination by charged particles even with a repulsive applied electric force. When the temperature of the plate’s surface was higher than the ambient temperature, the degree of particulate contamination on the surface of the face-up plate could be remarkably reduced in the presence of an electric field. The effect of repulsive thermophoresis, however, is expected to be reduced for very fine particles of high electric mobility or for micrometer-sized particles with large gravitational settling speed when the charged particles are influenced by an attractive electric force.
대기 고도에 따른 입자 포집용 관성 임팩터의 설계 및 포집효율 예측
김규호,육세진,안강호 한국입자에어로졸학회 2012 Particle and Aerosol Research Vol.8 No.1
In this study, the collection efficiency of inertial impactors was numerically simulated by employing the statistical Lagrangian particle tracking(SLPT) model. The SLPT model was proven to be correct in predicting the impactor collection efficiency, when the numerically obtained collection efficiencies were compared with the experimental data of Marple et al.(1987) at normal pressure level and the experimental data of Marjamäki et al.(2000) at low pressure level. Based on the validation results, balloon‐borne impactors with the cut‐off sizes of 1 ㎛, 2.5 ㎛, and 10 ㎛ were designed. Then, the sampling flowrates of the inertial impactors, required to keep the cut‐off sizes constant at different pressures and temperatures, were estimated according to the altitude.