Size-separating precipitation of aerosols in a spinning spiral duct

Stoeber, W.; Flachsbart, Hermann

doi:10.1021/es60035a002

Cited by 129 publications

(23 citation statements)

References 10 publications

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“…The improvement in resolution can clearly be seen as Q, decreased: singlet and multiplet particles were not distinguishable until Q, was lowered to 8 L/h, while at 3.6 L/h extremely good resolution was achieved with the separation of agglomerates containing as many as nine particles. At a minimum Q, of 3.6 L/h, chainlike triplets with an aerodynamic diameter (D,,) of 2.62 pm were resolved from triplets generated in the triangle form with D,, of 2.74 pm (Stober and Flaschbart, 1969). These results confirm that the resolution of the Inspec can be better than 5% when analyzing this size of aerosol particle (Prodi et al, 1982).…”

Section: Pm Diameter P a R T I C L E S Q=8 T H-'supporting

confidence: 61%

Experimental Assessment and Calibration of an Inertial Spectrometer

Mitchell

Nichols

1988

Aerosol Science and Technology

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An experimental assessment has been made of the performance of an inertial spectrometer to measure the aerodynamic diameter of aerosol particles. These studies have included a determination of the optimum operating conditions for good size resolution, and the calibration of the instrument with monodisperse aerosol particles. Sampling conditions had to be chosen with care in order to ensure that the instrument operated correctly and sep-

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Section: Pm Diameter P a R T I C L E S Q=8 T H-'supporting

confidence: 61%

Experimental Assessment and Calibration of an Inertial Spectrometer

Mitchell

Nichols

1988

Aerosol Science and Technology

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“…Another technique is to employ an external oscillatory field and Laser Doppler velocimetry to measure the relaxation time of the particles (Mazumder and Kirsch 1977). Also, different centrifuges have been used to deposit particles, sorted by relaxation time, on a foil for size measurement (Sawyer and Walton 1950;Goetz 1957;Stöber and Flachsbart 1969).…”

Section: Introductionmentioning

confidence: 99%

An Instrument for the Classification of Aerosols by Particle Relaxation Time: Theoretical Models of the Aerodynamic Aerosol Classifier

Tavakoli

Olfert

2013

Aerosol Science and Technology

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A new aerosol particle classifier, the aerodynamic aerosol classifier (AAC), is presented and its classifying characteristics are determined theoretically. The AAC consists of two rotating coaxial cylinders rotating at the same angular velocity. The aerosol to be classified enters through a gap in the inner cylinder and is carried axially by particle-free sheath flow. The centrifugal force causes the particles between the rotating cylinders to move in the radial direction and particles of a narrow range of particle relaxation times exit the classifier through a gap in the outer cylinder with the sample flow. Particles with larger relaxation times impact and adhere to the outer cylinder and particles with smaller relaxation times exit the classifier with the exhaust flow. Thus, the aerosol is classified by particle relaxation time from which the aerodynamic equivalent diameter can easily be found. Four theoretical models of the instrument transfer function are developed. Analytical particle streamline models (with and without the effects of particle diffusion), like those often used for mobility classifiers, are developed for the case when the centrifugal acceleration field is assumed to be uniform in the radial direction. More accurate models are developed when this assumption is not made. These models are the analytical limiting trajectory model which neglects the effects of diffusion and a numerical convective diffusion model that does not. It is shown that these models agree quite well when the gap between the cylinders is small compared to the radii of the cylinders. The models show that, theoretically, the AAC has a relatively wide classification range and high resolution.

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“…9 " 11 Particle size distributions were measured by an aerosol centrifuge. 12 The mass median aerodynamic diameter was 0.55 nm, the arithmetic standard deviation 0.48 ^m and the geometric standard deviation was 1.8 (Table I). Table I.…”

Section: Aerosol Generation and Exposure Systemmentioning

confidence: 95%

Lung carcinomas in rats after low level cadmium inhalation†

Oldiges

Hochrainer

Takenaka³

et al. 1984

Toxicological & Environmental Chemistry

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Three groups of 40 male Wistar rats were continuously exposed to CdCl 2 aerosols at 3 concentrations: 12.5, 25 and 50 μg/m 3 for 18 months. Forty-one rats kept in fresh air served as controls. Thirteen months after termination of the exposure, the surviving animals were sacrificed. Body weights and mortality were not significantly different between the four groups. Primary lung carcinomas, i.e. epidermoid carcinomas, † Presented at the Workshop on Carconogenic and/or Mutagenic Metal Compounds, Geneva, September 12-14, 1983. 41 TOXI. Downloaded by [The University Of Melbourne Libraries] at 13:26 19 June 2016 42 H. OLDIGES ET AL.adenocarcinomas, combined epidermoid and adenocarcinomas, and mucoepidermoid carcinomas were found in 71.4% (50 μg/m 3 group), 52.6% (25 μg/m 3 group) and 15.4% (12.5 μg/m 3 group) of the animals respectively. In addition, metastases in regional lymph nodes and the kidneys and invasion into regional lymph nodes and the heart were observed. Lung adenomas and nodular hyperplasia developed in several rats of the exposed groups. No primary lung tumors were found in the control group. These studies revealed a dose dependent incidence of primary lung carcinomas after inhalation of CdCl 2 aerosols in rats. Even a concentration of 12.5 μg/m 3 -well below present TLV values-led to a significant lung carcinoma rate.

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Size-separating precipitation of aerosols in a spinning spiral duct

Cited by 129 publications

References 10 publications

Experimental Assessment and Calibration of an Inertial Spectrometer

Experimental Assessment and Calibration of an Inertial Spectrometer

An Instrument for the Classification of Aerosols by Particle Relaxation Time: Theoretical Models of the Aerodynamic Aerosol Classifier

Lung carcinomas in rats after low level cadmium inhalation†

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