Abstract
The mixing characteristics of positive and negative pressure air mixers were investigated along with a V-type mixer, using glass-beads. A necessary task, performed by air, to mix a unit weight of glass beads to a certain degree of mixing was calculated for air mixers. It was found, over the present experimental range, that the negative pressure air mixer needed less work and less air than did the positive pressure air mixer. Measurements of the input electric power indicated that the V-type mixer was more advantageous than the air mixers for rather coarse mixing but was unable to attain as fine a homogeneity as was possible by using the air mixers.
