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Design and computational fluid dynamics investigation of a personal, high flow inhalable sampler.

Authors
Anthony-TR; Landázuri-AC; Van Dyke-M; Volckens-J
Source
Ann Occup Hyg 2010 Jun; 54(4):427-442
NIOSHTIC No.
20038225
Abstract
The objective of this research was to develop an inlet to meet the inhalable sampling criterion at 10 l min(-1) flow using the standard, 37-mm cassette. We designed a porous head for this cassette and evaluated its performance using computational fluid dynamics (CFD) modeling. Particle aspiration efficiency was simulated in a wind tunnel environment at 0.4 m s(-1) freestream velocity for a facing-the-wind orientation, with sampler oriented at both 0 degrees (horizontal) and 30 degrees down angles. The porous high-flow sampler oriented 30 degrees downward showed reasonable agreement with published mannequin wind tunnel studies and humanoid CFD investigations for solid particle aspiration into the mouth, whereas the horizontal orientation resulted in oversampling. Liquid particles were under-aspirated in all cases, however, with 41-84% lower aspiration efficiencies relative to solid particles. A sampler with a single central 15-mm pore at 10 l min(-1) was also investigated and was found to match the porous sampler's aspiration efficiency for solid particles; the single-pore sampler is expected to be more suitable for liquid particle use.
Keywords
Sampling-methods; Inhalants; Air-flow; Sampling-equipment; Equipment-design; Porous-materials; Fluid-mechanics; Particle-aerodynamics; Samplers; Particulate-sampling-methods; Fluids; Author Keywords: aerosol; computational fluid dynamics; droplet aspiration; inhalable sampler
Contact
T. Renée Anthony, Department of Occupational and Environmental Health, University of Iowa, 100 Oakdale Campus, 108 IREH, Iowa City, IA 52242-5000, USA
CODEN
AOHYA3
Publication Date
20100601
Document Type
Journal Article
Email Address
renee-anthony@uiowa.edu
Funding Type
Grant
Fiscal Year
2010
NTIS Accession No.
NTIS Price
Identifying No.
Grant-Number-R21-OH-009114; Grant-Number-T42-OH-009229
Issue of Publication
4
ISSN
0003-4878
Source Name
Annals of Occupational Hygiene
State
IA; AZ; CO
Performing Organization
Colorado State University - Fort Collins
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