Fundamental factors that affect dust generation.
Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina, 1991 May; :1-60
Factors that affect the amount and size distribution of dust generated by falling granular material in still air were examined using an apparatus with separate dust generating and measuring sections. Four granular materials were tested and a simple model was developed to describe the dust generation rate of these materials as a function of particle size, drop height, material flow, and moisture content. Moisture content strongly influenced the interparticle binding forces and the amount of dust generated. Drop height and material flow influenced the material separation forces and also showed significant influence on the amount of dust generated. In a second study, four factors that affect dust generation (test material, size distribution of the test material, moisture content of the test material, and the apparatus used for the tests) were investigated. Dust generated from silicon-carbide (409212) and aluminum-oxide (1344281) were measured using magnetic resonance imaging and Heubach dustiness testers. The size distribution of the test material slightly influenced the amount but strongly influenced the size distribution of the dust generated. Increased moisture content decreased the amount of dust generated but had little influence on dust size distribution.
NIOSH-Grant; Control-technology; Airborne-dusts; Physical-properties; Airborne-particles; Aerosols; Dust-particles
Epidemiology, University of North Carolina, Rosenau Hall 201 H, Chapel Hill, NC 27514
Final Grant Report
NTIS Accession No.
Control Technology and Personal Protective Equipment; Research Tools and Approaches; Control-technology
Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina
University of North Carolina Chapel Hill, Chapel Hill, North Carolina