Исследование столкновения частицы, движущейся в потоке газа с твердой стенкой

Abstract

The processes of extracting particulate matter include air, generally, the deposition of particles on dry or wetted surfaces and removing deposits from deposition surfaces. In the dust collector and the separation devices following methods of separating suspended solids from the weighing medium used: sedimentation in the gravitational field, sedimentation under the influence of inertial forces, as well as the deposition in a centrifugal field. Shock interaction of particles with the wall is a subject of research for a long time. Much of the research has been devoted to "dry" particles collision with the wall, that is a collision in a vacuum or an environment with little resistance. An important parameter characterizing the process of collision is elastic recovery ratio, defined as the ratio of the speed after impact to the velocity before impact. The calculation results show that the transfer of particles substantially in the horizontal direction depends on the particle diameter. Indeed, with an increase in particle size increases their inertia and the flow can not carry them over long distances. Furthermore, increase in size leads to an increase of deposition rate on the surface. Thus, smaller particles are transported over long distances than larger. This trend is observed for the particle size of less than 100mikron (seen in the movement of air). Next, mode of interaction with the wall varies greatly. Beat ceases to be completely inelastic. Particles incident on the wall is obtained momentum directed away from the wall and carried into the stream. Then, under the influence of gravitational forces they rise speed is slowed down, and the particles begin to move back towards the wall. The number of collisions increases with particle size. Thus, in the hammer mode of interaction the length to which the particles are transported, with their diameter increases.