Use of two virtual impactors in series as an aerosol generator

Chen, B.T.; Yeh, Hsu‐Chi; Rivero, Miguel Ángel

doi:10.1016/0021-8502(88)90262-5

Cited by 13 publications

(4 citation statements)

References 9 publications

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“…Masuda et al (1979) successfully employed a set of two virtual impactors to prepare test aerosols with narrow size distributions from actual coal dust and slate powder. Chen et al (1988) confirmed that two round-jet, in-series virtual impactors have the potential to be used as a quasi-monodisperse aerosol generator. Pilacinski et al (1990) used a virtual impactor to modify the size distribution of aerosols generated from a modified Wright nebulizer.…”

Section: Literature Reviewmentioning

confidence: 61%

A Virtual Impactor with Clean Air Core for the Generation of Aerosols with Narrow Size Distributions

Chein

Lundgren

1993

Aerosol Science and Technology

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An improved virtual impactor with interchangeable nozzles was designed and fahricated. One impactor nozzle, of 1.98-mm diameter, was ealihrated with monodisperse polystyrene latex spheres. The results show that the separation efficiency of this impactor can be predicted on a semiempirical basis. With a clean air core in the center of an aerosol Bow, this impactor has a better separation characteristic than the conventional virtual impactor. Aerosols with narrow size distributions were obtained by passing Arizona road dust particles through this impactor. The mass median diameter (MIMD) of these aerosols varies from 10.0 to 3 3 pm with the geometric standard deviation (GSD) ranging from 1.16 to 1.48. The mass concentrations ( M a ) of these aerosols ranges over several orders of magnitude from 0.03 to 13 mg/m3. Aerosols with the MMD values ranging from 2.0 to 0.98 prn were oblained with this virtual impactor followed by a real impactor. The GSD values of these aerosols vary from 1.44 to 1.28 and the Ma range from 0.07 to 3.57 mg/m3. The effects of varying total flow rate ( Q , ) , clean air flow ratio ( q ) , and minor Row ratio ( r ) were investigated. As Q , decreases, the MMD becomes larger and the GSD is decreased. With increasing q, the distribution curve becomes narrower and the Ma decreases. In addition, the fine particle contamination increases as r increases.

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Section: Literature Reviewmentioning

confidence: 61%

A Virtual Impactor with Clean Air Core for the Generation of Aerosols with Narrow Size Distributions

Chein

Lundgren

1993

Aerosol Science and Technology

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“…Later, Masuda et al (1987) used a single-stage rectangular virtual impactor to classify powders for the ceramic industry. Chen et al (1988) used two virtual impactors to generate narrow size ranges of raw oil shale, talc, and fly ash particles. They used two virtual impactors with cut sizes of 4.4 and 3.1 μm, respectively, and classified the powder into three size classes: (1) greater than the larger cut size (coarse), (2) smaller than the smaller cut size (fine), and (3) between the two cut sizes (middle).…”

Section: Virtual Impactors In Dust Generators To Provide Narrow Size mentioning

confidence: 99%

Aerosol Science and Technology: History and Reviews

Ensor¹

2011

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Aerosol Science and Technology: History and Reviews captures an exciting slice of history in the evolution of aerosol science. It presents in-depth biographies of four leading international aerosol researchers and highlights pivotal research institutions in New York, Minnesota, and Austria. One collection of chapters reflects on the legacy of the Pasadena smog experiment, while another presents a fascinating overview of military applications and nuclear aerosols. Finally, prominent researchers offer detailed reviews of aerosol measurement, processes, experiments, and technology that changed the face of aerosol science. This volume is the third in a series and is supported by the American Association for Aerosol Research (AAAR) History Working Group, whose goal is to produce archival books from its symposiums on the history of aerosol science to ensure a lasting record. It is based on papers presented at the Third Aerosol History Symposium on September 8 and 9, 2006, in St. Paul, Minnesota, USA.

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“…When used in conjunction with an aerosol analyzer, such as an optical counter (Keskinen et al, 1987), or for a medical application (Barr et al, 1983), the primary purpose of the virtual impactor is to eliminate the small particle fraction. Two virtual impactors can be used in series in order to extract a specific size range (Chen et al, 1988). In our size-fractionating aerosol generator ( Figure I), developed for use with new respirator fit testing methods, we have incorporated a virtual impaction stage in order to minimize the fraction of submicrometer aerosols and maximize the fraction in the 2-4-pm size range.…”

Section: Virtual Impactionmentioning

confidence: 99%

Size-Fractionating Aerosol Generator

Pilacinski

Ruuskanen

Chen

et al. 1990

Aerosol Science and Technology

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An aerosol generator has been developed and evaluthrough selection of the pressure drop and the gas-toated for applications where the aerosol concentration liquid flow rate ratio. Further modification of the size and size distribution need to be tailored to specific distribution is achieved through virtual and solid-plate needs. In this device, a modified Wright nebulizer impaction so that specific aerosol concentration in spegenerates the primary aerosol whose concentration and, cific size ranges can be chosen as the aerosol output. to a limited degree, size distribution are adjusted

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Use of two virtual impactors in series as an aerosol generator

Cited by 13 publications

References 9 publications

A Virtual Impactor with Clean Air Core for the Generation of Aerosols with Narrow Size Distributions

A Virtual Impactor with Clean Air Core for the Generation of Aerosols with Narrow Size Distributions

Aerosol Science and Technology: History and Reviews

Size-Fractionating Aerosol Generator

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