TY - CONF A1 - Klippel, Alexander A1 - Scheid, Marc A1 - Krause, U. A2 - Makhviladze, G. A2 - Molkov, V. A2 - Bradley, D. A2 - Sunderland, P. A2 - Tamanini, F. T1 - Progress on the research into the influence of dustiness on dust explosions T2 - ISFEH7 - 7th International seminar on fire & explosion hazards (Proceedings) N2 - In practice, occurring explosive dust/air mixtures are usually not homogeneous and in many cases do not spread over the whole enclosure. For the safety measure explosion venting, a smaller venting area might be sufficient as calculated according to venting standards (EN 14491 'Dust Explosion Venting Protective Systems'). The tendency of bulk materials to form dust clouds is not taken into account so far. To optimize the design of explosion protection measures, a new safety characteristic the so-called 'dustiness' (see VDI 2263 part 9 'Determination of Dustiness of Bulk Materials'.) could be useful. Dustiness means the tendency of dust to form dust clouds. There are six dustiness groups (DG) from one to six (one means little tendency to stay airborne, six the opposite). The paper describes first results on the reasons for different dustiness and on dust explosion venting for several dusts of different dustiness. A 75 L vertical tube apparatus for vented dust explosion experiments was created. Pressure, pressure rises and flame speeds were measured to evaluate the course of the dust explosions. In addition the paper includes CFD simulations (ANSYS CFX) about the possibilities to model the dust/air mixtures with the Euler/Lagrange approach. In order to simulate the settling of dust clouds more realistic the particle surface area was adjusted and the particle size distribution was taken into account. Results were compared to experimentally determined terminal velocities. PB - Research Publishing T2 - ISFEH7 - 7th International seminar on fire & explosion hazards CY - Providence, RI, USA DA - 05.05.2013 KW - CFD KW - Dust explosions KW - Dustiness KW - Venting PY - 2013 UR - https://opus4.kobv.de/opus4-bam/frontdoor/index/index/docId/28502 AN - OPUS4-28502 SN - 978-981-07-5936-0 SN - 978-981-07-5940-7 SP - 781 EP - 790 AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany