Simulation of Particle Size-Selective Air Samplers Placed in a Polydisperse Aerosol
Titel:
Simulation of Particle Size-Selective Air Samplers Placed in a Polydisperse Aerosol
Auteur:
Fabries, J. F.
Verschenen in:
Aerosol science and technology
Paginering:
Jaargang 12 (1990) nr. 3 pagina's 673-685
Jaar:
1990
Inhoud:
The results of a numerical simulation of several air sampling instruments are presented. They are assumed to sample the same aerosol, with a log-normal particle-size distribution. Four instruments were studied: the 10-mm nylon cyclone, the MRE 113A gravimetric sampler, the CPM 3, and the CIP 10. The experimental data of particle collection efficiency were reduced by a model for each instrument. The model used combines two cumulative log-normal distribution functions, in order to have a good degree of flexibility necessary for representing the data of some devices that exhibit a maximum in efficiency (CPM 3, CIP 10). The concentrations “measured” by several air samplers were compared with each other; the differences were analyzed as functions of the aerosol parameters: mass median aerodynamic diameter and σg. The results that were obtained and those calculated from standard collection efficiencies, defining the conventional alveolar fraction of the aerosol, were also taken into account. This simulation method can be extended to any type of instrument and aerosol, and enables the prediction of the maximal deviations that could be observed between different instruments, or between one instrument and some reference standards.
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