Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
9460474 | Journal of Aerosol Science | 2005 | 16 Pages |
Abstract
The counting efficiency of the TSI CPC 7610 operated with FC-43 as working fluid was investigated for three temperature differences in the pressure range 60-1000Â hPa. At the standard temperature difference of 17Â K, the CPC threshold diameter decreases from 20 to 11.5Â nm and the maximum counting efficiency increases from â¼30% to â¼100% as the operating pressure is reduced from 1000Â hPa down to 60Â hPa. Calibration with NaCl and H2SO4 particles indicates that the counting efficiency depends on particle material. Comparing the results with butanol curves shows that butanol yields above 200Â hPa more stable counting efficiency curves with lower threshold diameters and higher maximum counting efficiencies. However, below 200Â hPa, FC-43 shows the better performance and can be used at least down to 60Â hPa. Computational fluid dynamics modelling was carried out to explain some of the observed differences.
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Atmospheric Science
Authors
M. Hermann, S. Adler, R. Caldow, F. Stratmann, A. Wiedensohler,