The influence of flow and turbulence on flame propagation through dust-airmixtures

Citation
U. Krause et T. Kasch, The influence of flow and turbulence on flame propagation through dust-airmixtures, J LOSS PREV, 13(3-5), 2000, pp. 291-298
Citations number
18
Categorie Soggetti
Chemical Engineering
Journal title
JOURNAL OF LOSS PREVENTION IN THE PROCESS INDUSTRIES
ISSN journal
09504230 → ACNP
Volume
13
Issue
3-5
Year of publication
2000
Pages
291 - 298
Database
ISI
SICI code
0950-4230(200005/10)13:3-5<291:TIOFAT>2.0.ZU;2-P
Abstract
Dust explosions are time-dependent flame propagation processes. Their descr iption with "lumped parameter models" like the K-St value are of Limited va lidity only. More evidence of the process of flame propagation may be expec ted from an investigation of the flame velocity being composed by the lamin ar and turbulent velocities and the flow velocity. In the present paper the influences of the dust concentration and the flow velocity have been inves tigated by experiments in tube apparatus of three different diameters showi ng the dominating influence of the flow velocity and the turbulent rms velo city on the flame propagation. In addition, laminar and turbulent flame propagation has been investigated by an appropriate numerical model. Furthermore flow structures and particle distributions have been computed in a real size grain silo to assess the e ffects of possible explosions. (C) 2000 Elsevier Science Ltd. All rights re served.