Movement of Small Particles Caused by an Air Flow in a Chamber

抄録

The movements of small particles distributed uniformly in an unsteady flow in a square chamber having an inlet and an outlet are simulated numerically. The particles are classified into three types according to their final state : the exhaust type in which the particles are exhausted through the outlet ; the circulation type in which the particles circulate in the chamber, and the adhesion type in which the particles adhere to the walls of the chamber. The influences of the initial position of a particle, the Reynolds number R and the dimension ratio N characterizing whether a particle is coarse or fine, on the ratios of the number of particles in each type to the total number of particles are examined. The number of particles of the exhaust type has a maximum at a certain orbit. The particles of the adhesion type adhere to the walls in vicinity of the stagnation points.