Fahrenwald浮選機のインペラーにおける気泡の流れ模様 (第5報)

気泡の再破砕

抄録

One of major functions of this type of flotator is considered to be recomminution of the bubbles flown in, the mechanism of which has not yet been known in detail.
Starting from this point and by way of comparative study of the behaviors of natural air bubbles around the columns placed in the water-flow-channel, the author has confirmed the following results.
1) Vortices induced by the separation of the boundary layer of the cylinder wall, elongation due to the contraction of flow tube between the columns, strained lateral elongation due to their collision against the high pressure zone formed at the front side of the column tobe most effective comminutive actions against the bubbles.
2) Mingling of the frother, viscous liquid, solid particles inflicted essential influences upon the above actions.
3) To design the impeller and the baffling blade employing a series of round columns so as they can effectively utilize the above actions is necessary.
The result shown above is similar to the air bubbles in the water-flow around a flat-plate and it is the basis by which the mechanism of recomminution of air bubbles in the impeller of this type can be made clear.