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http://dx.doi.org/10.3795/KSME-B.2003.27.3.326

Study on the Influence of Mixing Effect to the Measurement of Particle Size Distribution using DMA and CPC  

Lee, Youn-Soo (한국과학기술원 기계공학과 입자공학연구실)
Ahn, Kang-Ho (한양대학교 기계공학과)
Kim, Sang-Soo (한국과학기술원 기계공학과)
Publication Information
Transactions of the Korean Society of Mechanical Engineers B / v.27, no.3, 2003 , pp. 326-333 More about this Journal
Abstract
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.
Keywords
Differential Mobility Analyzer; Condensation Particle Counter; Particle Size Distribution; Mixing Effect; Accelerated Measurement; DMA; CPC;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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