Title: Leveraging Dual-Mode Vibration to Induce Horizontal Motion of Bubbles in Gas-Fluidized Granular Materials

Author (Talk): Oscar Punch, Columbia University

Abstract:

We leverage a non-shift symmetric dual-mode frequency sine wave to impart net positive horizontal vibration forces on a fluidized bed for controlled horizontal motion of particles and bubbles. When the gas is pulsed and structured bubbling is formed, the presence of a dual-mode horizontal vibration shifts the bubble nucleation zone and bubbles move horizontally with regularity every two gas oscillation cycles. More generally, we find that for a constant fluidizing gas the maximum horizontal particle velocity occurs at the minimum fluidization velocity. This work addresses the compartmentalization issue in dynamically structured bubbling to allow for improved horizontal mixing, with no bubble deformation, and also presents guidelines for using dual-mode horizontal vibration to improve mixing efficiency in fluidized granular materials.