Dynamic mechanisms of a vibration bed under weakly excitation

The phenomena of granular motion in a weakly vibrating bed were different from that in a strong vibrated bed. Many studies have shown that a granular bed can be fluidized by external excitation and several different kinds of complicated phenomena under external vibrations can be generated, such as heaping, pattern formation, convection, fluidization, size segregation, surface wave, and arching. However, most previous works focused on the vibrated system under the strong vibration, and very few studies investigated the dynamic mechanisms of particles under a weakly excited system. The paper intends to investigate the dynamic mechanisms of particulates of a weakly vibration bed. The heights of solid-like layer and depths of liquid-like layer were measured under different vibrated conditions. Three different motion regimes, such as complete solid-like region, liquid-like region, and fully liquid-like region, were found from the phase diagram of granular motion states in a weakly vibrating bed.