Deposition and Repulsion of Dust Particles Impacted on an Obstacle Setting in a Dusty Gas Flow

The behavior of dust particles depositing on a circular obstacle setting in a turbulent dusty gas flow was observed. On various conditions of gas velocity and temperature, a change of shape with time, final equilibrium shape and void fraction on the dust pile of three kinds of powder were measured. It is shown that the weight of deposited particles under final equilibrium conditions are not correlated with a particle kinetic energy but are correlated with the ratio of kinetic energy to adhesion force per unit particle. It is promising that the adhesion probability at the beginning of deposition may also be correlated with the same ratio. Consequently, in the consideration about particle deposition and repulsion, it is clear that mechanical properties of powder are important along with particle kinetic energy.