DEFORMATIONS AND SPLITTINGS OF A BUBBLE IN A TWO-DIMENSIONAL FLUIDIZED BED

[摘要] References(3)To explain experimental results of bubble deformations and splittings, a model assuming that these phenomena come from the growing of a disturbance generated at the bubble surface near the stagnation point is proposed. The motion of particles is expressed by the velocity potential around a steadily rising bubble. Under the condition of constant pressure within a bubble, the differential equations for the bubble deformation were derived from the velocity potential and were solved with the initial condition that the disturbance was generated at time 7=0. It was assumed that the disturbance is presented as the centripetal velocity of particles superposed on the normal velocity at the bubble surface. The bubble splitting was also calculated by the same model for the case of stronger intensity of disturbance. Calculated results agree qualitatively with experimental values of bubble deformations and splittings.