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광촉매 마이크로 반응기의 내부 형상에 따른 VOC 분해특성에 관한 수치해석적 연구
용정권(Jung Kwon Yong),김창녕(Chang Nyung Kim),염민규(Min-Qou Youm) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
A numerical analysis was carried out to investigate the degradation of Volatile Organic Compounds (VOC) in photocatalytic microreactors with different inner geometries. Two different cases of microreactor were considered, namely, one microreactor has bump on the channel and the other has no bump on the channel. The removal efficiency of VOC has been calculated by the Langmuir-Hinshelwood reaction rate equation that was obtained from the experimental results. From the numerical calculations, it was observed that the conversion ratio of VOC for the microchannel with bump is about 4.5% greater than the microchannel without bump. And the mass transfer characteristics in the microreactor are also shown in numerical results. These results can be used effectively for the photocatalytic numerical analysis.
장방형 흡입식 슬러지 수집기에서 수로의 최적설계 및 폐수 유동특성
용정권(Jung Kwon Yong),최청렬(Chung Ryul Choi),김창녕(Chang Nyung Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Recently, the sludge suction collector is preferred rather than the scraper type sludge collector due to enhancement of the clarifier efficiency. The sludge suction collector is usually operated by the user's experience without any scientific and technical consideration. There are many factors that should be considered for higher quality of discharged water and stabilized flow in the rectangular sludge suction collector but, the optimal design on the inflow channel and orifices connecting with the inflow channel is needed for similar flow rates at the orifices. The 4 cases of channel geometry are considered and mass flow rates of each case at the orifices are evaluated using Computational Fluid Dynamics applied VOF(Volume of Fraction) model.
압전 구동방식 마이크로 펌프에서 기하학적 형상과 작동조건에 따른 펌핑특성에 대한 실험적 연구
용정권(Jung Kwon Yong),김창녕(Chang Nyung Kim),김진욱(Chin Uck Kim) 대한설비공학회 2009 설비공학 논문집 Vol.21 No.1
In the present experimental study, the pumping performances of diffuser/nozzle based piezoelectric micropumps are estimated with different operating factors and geometries. Here, the effects of the input voltage and frequency on the pumping performances have been examined together with the influences of the positions of the inlet and outlet. The results show that the flow rate of the micropump is larger with larger input voltage with the largest flow rates for the frequency to be close to 6.0 ㎐ all through the current experimental study. Also, it has been found that the positions of the inlet and outlet affect much on the performance of the piezoelectric micropumps. Error estimation has been carried out for the evaluation of the pumping performance in association with the uncertainty of the measurement.
사이클론 내 유동특성 및 미세입자 집진효율에 대한 수치해석적 연구
용정권(Jung Kwon Yong),김창녕(Chang Nyung Kim),조영민(Young Min Jo) 대한설비공학회 2008 설비공학 논문집 Vol.20 No.2
A numerical analysis has been carried out to examine the flow characteristics and the collection efficiency for fine particles in a cyclone using Computational Fluid Dynamics (CFD) technique. The cyclone with the cylinder diameter of 60 ㎜ has been considered for the investigation of the particle collection in a relatively smaller cyclone with somewhat higher inlet air velocities. Fundamental air flow patterns for different inlet velocities have been calculated and then the motions of particles of different sizes have been obtained. The calculated collection efficiencies for fine particles are compared with the experimental results, which shows a good agreement. The current result can be used for the design of cyclones with high collection efficiency.
전자기 저항을 이용한 열공압형 마이크로 펌프에서 통전유체의 유동 및 펌핑 특성에 관한 연구
오세홍(Se Hong Oh),용정권(Jung Kwon Yong),김창녕(Chang Nyung Kim) 대한설비공학회 2011 설비공학 논문집 Vol.23 No.1
An analysis has been conducted of the flow characteristics and pumping performance of a thermopneumatic micropump with electrically conducting fluid. In the present study, considered is a thermopneumatic micropump for electrically conducting fluids with electromagnetic resistance alternately exerted at the inlet and outlet by alternately applied magnetic fields. A model of Prescribed Deformation is used for the motion of the membrane. Here, the pumping performance of the micropump and flow characteristics of the electrically conducting fluid are investigated in the range of Hartmann number less than 30. The current numerical study shows that the net flow rate through the micropump is almost proportional to the strength of the applied magnetic field.