화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.26, No.6, 1770-1777, November, 2009
DOI10.1007/s11814-009-0261-0  Export Citation
Experimental characterization of a short electrical mobility spectrometer for aerosol size classification
Panich Intra†, and Nakorn Tippayawong1
  • College of Integrated Science and Technology, Rajamangala University of Technology Lanna, Chiang Mai 50300, Thailand
  • 1Department of Mechanical Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
E-mail:
A prototype of a short column electrical mobility spectrometer (EMS) for size measurement of aerosol particle was design, constructed, and experimentally characterized. The short EMS consists of a particle charger, a size classifier column, and a multi-channel electrometer. Its particle size resolution is derived from a 10 channel electrometer detector. The short EMS is capable of size measurements in the range between 10 nm to 1,000 nm with a time response of about 50 s for full up and down scan. Particle number concentration in which the short EMS can measure ranges from 10^(11) to 10^(13) particles/m3. The operating flow rate of the short EMS is set for the aerosol flow rate of 1.0-2.0 l/min and the sheath air flow rate fixed at 10.0 l/min. The inner electrode voltage of the classifier can be varied between 500-3,000 VDC. The short EMS operates at sub-atmospheric pressure, typically at 526 mbar. Validation of the short EMS performance was performed against a scanning electron microscope (SEM). Good agreements were obtained from comparison between sizes determined from the short EMS classifier and the SEM analysis. Signal current from the detector was also analyzed to give rise to number concentration of particles. Experimental results obtained appeared to agree well with the theoretical predictions.
Keywords:Aerosol;Particle;Electrical Mobility;Size Distribution;Spectrometer
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