Evaluation of the TSI small-scale powder disperser

Chen, B.T.; Yeh, Hsu‐Chi; Fan, Bijian

doi:10.1016/0021-8502(96)80777-4

Cited by 17 publications

(6 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For all supermicron sizes, a small-scale powder disperser (SSPD, 3433, TSI) was used to generate aerosol samples (Chen et al, 1995;Cheng et al, 1999). PSL's were loaded on to a pre-cleaned turn-table prior to being inhaled and expelled into the aerosol dispersion chamber by the SSPD.…”

Section: Methodsmentioning

confidence: 99%

Measurement of the particle counting efficiency of the “Waveband Integrated Bioaerosol Sensor” model number 4 (WIBS-4)

Healy

O’Connor

Sodeau

2012

Journal of Aerosol Science

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

Measurement of the particle counting efficiency of the “Waveband Integrated Bioaerosol Sensor” model number 4 (WIBS-4)

Healy

O’Connor

Sodeau

2012

Journal of Aerosol Science

View full text Add to dashboard Cite

“…Particle sizes were determined using an optical or electron microscope and image analyzer. Particles >5 µm were generated as a dry powder from a small-scale powder disperser (Model 3433, TSI Inc.) (Chen et al 1995), and particles <5 µm were generated from a Respirgard II R nebulizer (Marquest Medical Products Inc., Englewood, CO, USA). The aerosols passed through a Kr-85 tube to bring the particle charge to Boltzmann's equilibrium, and then entered the TB cast through the oral cavity.…”

Section: Aerosol Generation and Experimental Set-upmentioning

confidence: 99%

Particle Deposition in a Cast of Human Tracheobronchial Airways

Zhou

Cheng

2005

Aerosol Science and Technology

105

View full text Add to dashboard Cite

Regional particle deposition efficiency and deposition patterns were studied experimentally in a human airway replica made from an adult cadaver. The replica includes the oral cavity, pharynx, larynx, trachea, and four generations of bronchi. This study reports deposition results in the tracheobronchial (TB) region. Nine different sizes of monodispersed, polystyrene latex fluorescent particles in the size range of 0.93-30 µm were delivered into the lung cast with the flow rates of 15, 30, and 60 l min −1 . Deposition in the TB region appeared to increase with the increasing flow rate and particle size. Comparison of deposition data obtained from physical casts showed agreement with results obtained from realistic airway replicas that included the larynx. Deposition data obtained from idealized airway models or replicas showed lower deposition efficiency. We also compared experimental data with theoretical models based on a simplified bend and bifurcation model. A deposition equation derived from these models was used in a lung dosimetry model for inhaled particles, and we demonstrated that there was general agreement with theoretical models. However, the agreement was not consistent over the large range of Stokes number. The deposition efficiency was found as a function of the Stokes number, bifurcation angle, and the diameters of parent and daughter tubes. An empirical model was developed for the particle deposition efficiency in the TB region based on the experimental data. This model, combined with the oral deposition model developed previously, can be used to predict the particle deposition for inertial effects with improved accuracy.

show abstract

“…The SSPD consisted of a rotational disk coated with powder and a suction tube to collect the fibers from the disk and disperse them as an aerosol. (3,18) The aerosol was delivered at a flow rate of 22.5 L min −1 . Fine chrysotile fibers were generated by nebulization.…”

Section: Spherical Particle Penetration Of the Filtersmentioning

confidence: 99%

Evaluation of Respirator Filters for Asbestos Fibers

Cheng

Holmes

Fan

2006

Journal of Occupational and Environmental Hygiene

View full text Add to dashboard Cite

Fiber aerosols are known to have different aerodynamic behaviors than spherical particles and usually carry higher electrostatic charges. We investigated the effects of flow rate and charge status of filter cartridges on the penetration of spherical and fiber aerosols. Four types of test respirator filters were selected: two for passive respirators, one for a powered respirator, and one disposable respirator. Surface charges on respirator filters were determined using a noncontact field electrostatic field meter. Penetration tests were performed for filter cartridges before and after charge neutralization. The surface charge measurements on the respirator filters showed that some filters, including those used in disposable face masks, are charged to enhance the collection efficiency. Only high-efficiency particulate air filters performed consistently for both spherical test aerosols and the three types of asbestos fibers. The surface charge potential of filter cartridges and flow rate did not appear to affect the performance of these filters. In contrast to the high-efficiency filters, the aerosol penetration performance of low-efficiency filters and face masks deteriorated when the charge potential on the filter was removed. Our data also showed that the surface charges decreased in a high-temperature, high-humidity environment and disappeared after 1 week. Deposition of spherical particles and fibers in the charged disposable facemask filter was enhanced. For charged-neutralized, low-efficiency filter cartridges, asbestos fibers may penetrate more than spherical particles with a mean particle size of 0.3 microm diameter.

show abstract

Evaluation of the TSI small-scale powder disperser

Cited by 17 publications

References 8 publications

Measurement of the particle counting efficiency of the “Waveband Integrated Bioaerosol Sensor” model number 4 (WIBS-4)

Measurement of the particle counting efficiency of the “Waveband Integrated Bioaerosol Sensor” model number 4 (WIBS-4)

Particle Deposition in a Cast of Human Tracheobronchial Airways

Evaluation of Respirator Filters for Asbestos Fibers

Contact Info

Product

Resources

About