Secondary Dust Explosions.
Srinath-SR; Kauffman-CW; Nicholls-JA; Sichel-M
Industrial Dust Explosions, Symposium on Industrial Dust Explosions, Pittsburgh, Pennsylvania, 10-13 June 1986 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;
Aerospace Engineering University of Michigan Dept of Aerospace Engineering Ann Arbor, Mich 48109
Traumatic Injuries; Disease and Injury;
Industrial Dust Explosions, Symposium on Industrial Dust Explosions, Pittsburgh, Pennsylvania, 10-13 June 1986
University of Michigan at Ann Arbor, Ann Arbor, Michigan