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Differential Mobility Analyzer(DMA)내의 입자운동 및 특성 분석
안강호,김남효,이종호,배귀남,An, Gang-Ho,Kim, Nam-Hyo,Lee, Jong-Ho,Bae, Gwi-Nam 대한기계학회 1996 大韓機械學會論文集B Vol.20 No.6
Particle paths and flow fields in a prototype differential mobility analyzer (DMA) were numerically analyzed solving Navier-Stokes equation, electric field equation and particle motion considering viscous drag force, Coulomb force and polarization force. Analytically predicted particle diameters for the prototype DMA are in good agreement with the measured particle diameters within $\pm$1%. And the analytically predicted particle diameters are also in good agreement with numerical results for the prototype DMA.
혼합효과가 DMA와 CPC를 이용한 입자분포 측정에 미치는 영향에 관한 연구
이윤수,안강호,김상수,Lee, Youn-Soo,Ahn, Kang-Ho,Kim, Sang-Soo 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.3
In the measurement using DMA and CPC in series, there is some time delay for particles classified in DMA to detect in CPC. During this time, the DMA time-response changes due to the velocity profile of sampling tube and the diffusion of particles in the volume that exists between the DMA exit and the detector of ultra-fine CPC. This is called mixing effect. In the accelerated measurement methods like the TSI -SMPS, the size distribution is obtained from the correlation between the time-varying electrical potential of the DMA and the corresponding particle concentrations sampled in DMA. If the DMA time -response changes during this delay time, this can cause the error of a size distribution measured by this accelerated technique. The kernel function considering this mixing effect using the residence time distribution is proposed by Russell et al. In this study, we obtained a size distribution using this kernel to compare to the result obtained by the commercial accelerated measurement system, TSI -SMPS for verification and considered the errors that result from the mixing effect with the geometric mean diameters of originally sampled particles, using virtually calculated responses obtained with this kernel as input data.