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Mathematical modelling of dust layer dispersion due to rarefaction waves

Klemens R., Kosinski P., Oleszczak P.

Archivum Combustionis

2002

Vol. 22 nr 1-2

3-12

One of the methods of dust explosions mitigation is the use of venting systems, the task of which is to diminish the pressure rise. Nevertheless, the systems posses some inherent drawbacks. One of them is the presence of rarefaction wave, which propagates back and may interact with dust layers, which are present inside the facility. The objective of the study is to simulate the process of dust lifting caused by rarefaction waves and show how it may lead to the formation of combustible dust-air cloud.

Numerical modelling of coal mine explosion

Klemens R., Kosinski P., Wolanski P., Korobeinikov V. P., Markov V. V., Menshov I. S., Semenov I. V.

Archivum Combustionis

2001

Vol. 21 nr 1

71-79

The investigation of unsteady processes behind shock waves propagating in a gasdust combustible mixture is very important to understand mechanisms of industrial dust explosions like those in coal mines. In the paper, two aspects of this study are considered. The first one concerns questions related to ignition and burning of the mixture, where some results are given of numerical investigation of the transition to detonation process. Also 2D structure of unsteady detonation in the mixture of coal particles with air is taken into consideration. In the applied model, the moving medium is treated as a two-phase, two-velocity and two-temperature continuuum with mechanical and thermal interaction between the phases. Devolatilization, gas-gas and gas-particle exothermic chemical reactions, radiation and heat conduction are also taken into account. The other aspect is the problem of the dust enhancement and dispersion from the dust layer behind a shock wave. The forces caused by particles rotation and gas vorticity are taken additionally into account. Two numerical methods were developed to solve numerically the considered problems. Examples of calculations are presented.