抄録
When a shock wave propagates over a dust layer composed of many small solid particles, lifted and dispersed particles form a dust cloud in the shock-induced flow. The dust cloud has a possibility of causing a propagating dust explosion in galleries of the coal mine and factories which treat flammable powder, so that the analysis and prediction of this phenomenon are very important to forestall the dangerous explosion. In this paper, two results of numerical simulations about the initial process of this phenomenon are introduced. The first result shows that a particle on a wall is lifted by the shock-induced flow, and a lift force on the particle changes with the clearance between the particle and the wall. The second result shows that many particles are lifted and dispersed in the shock-induced flow, and the upward velocities of lifted particles were given by particle-particle interactions rather than by fluid lift forces such as Saffman force and Magnus force. Furthermore, the computed dust cloud was almost same as observed in experiments.
