Dynamics of particulate materials discharged in a granular vibration pumping system

A granular vibration pumping system, which vertically transports particles using a vibrating pipe, offers industrial advantages, such as a compact design, high dust tolerance, and the elimination of pneumatic materials. When the pipe is inserted into particulate materials and vibrated, particles climb inside through a process known as granular capillary action. While earlier studies focused on the height of particle ascent in a pipe, this research emphasizes particle expulsion and transport dynamics, which are more critical for practical applications. High-speed camera observations revealed a unique granular fountain phenomenon at the outlet of a straight pipe. In addition, experiments with a bent pipe were performed to facilitate the collection of transported particles, enabling the evaluation of granular transport rates under various vibration conditions.