Study on the Terminal Velocity of Grain Group

Abstract

The terminal velocity of a particle is determined by dropping it in still air, but present experiments were designed to provide relative air velocity on seed grains suspended in the air flow, and it was done with grain particle group. The following grains were investigated—corns, soybeans, rice, and hulled rice seeds. Within the limits of these data, it was found that the terminal velocity of grain particle group decreases as the weight of grains increases, for air displaced with grain group is not negligible.
This tendency is more remarkable when the grain has rough surface.
Next, the relation between pressure drop and mean air velocity were investigated. The resistance to flow through the grains increases more rapidly in the case of smaller grain.