Impaction model for the aspiration efficiencies of aerosol samplers in moving air under orientation-averaged conditions

P. J. Tsai, J. H. Vincent, D. Mark, George Maldonado

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20 Scopus citations


This paper applies what is already known about the aspiration efficiency of blunt aerosol samplers at large angles to the interesting case of sampling under “orientation-averaged” conditions. This is particularly relevant to practical aerosol sampling in workplaces and the atmospheric environment. The resultant semiempirical model of aspiration efficiency contains a number of coefficients which are fitted by nonlinear regression to data sets for the human head and for two rotating-head inhalable aerosol samplers (a 3 L/min sampler intended for applications in workplaces and a 70 L/min sampler intended for particle sampling in the ambient atmosphere). Agreement for all three data sets (with 88, 64, and 37 records respectively) is generally good, with an overall R 2corr of 68%. Such semiempirical models can be useful for predicting and interpreting sampler performance until practical versions of more rigorous mathematical and numerical models become available.

Original languageEnglish (US)
Pages (from-to)271-286
Number of pages16
JournalAerosol Science and Technology
Issue number3
StatePublished - Jan 1 1995

Bibliographical note

Funding Information:
The work described in this paper is part of a body of work supported by the Nickel Producers Environmental Research Association (NiPERA) as part of a program of research on aerosol exposure assessment. That support is gratefully acknowledged. In addition, one of the authors (PJT) carried out this work while attending the University of Minnesota on a scholarship from the Government of the Republic of China (Taiwan), and is grateful for this support.


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