Secondary dust explosions.
Srinath-SR; Kauffman-CW; Nicholls-JA; Sichel-M
Industrial dust explosions, symposium on industrial dust explosions, June 10-13, 1986, Pittsburgh, Pennsylvania. Cashdollar KL, Hertzberg M, eds. West Conshohocken, PA: ASTM International, ASTM Special Technical Publication 958, 1987 Oct; :90-106
Data comparing secondary dust explosions supported by baghouse dust and floor sweepings deposited in the form of a layer were presented. A flame acceleration tube was used to study the secondary explosions. Material studied included flow enhanced cornstarch, small size cornstarch, baghouse dust, floor sweepings, wheat dust, and navy bean dust. Comparisons were made for the observed pressures, flame velocities, gas velocities, gas temperatures, and dispersed dust concentrations. The presence of turbulence generating grids in the flame path results in flame acceleration which was analogous to gaseous flames. The observations confirm the findings of numerical models. Bean dust was able to sustain secondary dust explosions under certain conditions and thus act as a flame carrier. The processed corn starches tested were substantially more explosive than generic grain dusts. Turbulence generating grids in the path of dusty flames increase pressures and flame velocities while they decrease gas velocities and dispersed dust concentrations. No fundamental changes were noted in the dust dispersion process using high speed motion photography when grids were introduced in the flame path or when the dust layer thickness was substantially reduced at a given mass loading.
NIOSH-Grant; Traumatic-injuries; Explosive-hazards; Grain-dusts; Organic-dusts; Airborne-particles; Explosive-dusts; Explosive-gases; Explosive-atmospheres;
Author Keywords: dust explosions; grain elevator explosions; agricultural explosions; industrial explosions; secondary explosions; dust combustion; heterogeneous combustion; flame acceleration; turbulent reacting flows; two-phase flows
Aerospace Engineering University of Michigan, Department of Aerospace Engineering, Ann Arbor, MI 48109
Industrial dust explosions, symposium on industrial dust explosions, June 10-13, 1986, Pittsburgh, Pennsylvania
University of Michigan at Ann Arbor, Ann Arbor, Michigan