Granular particles can be induced to move against gravity upwards through a pipe or tube that is partially inserted under the powder free surface while subject to vertical vibration. This offers a new approach for transporting bulk material. In this paper, the effects of both vibration parameters and insertion depth of a pipe on particle motion are experimentally studied. A minimum vibration amplitude (A) and frequency (f) are necessary for particle motion to occur. There is a monotonic increase of the final rise height of the powder (h_eq) with increasing amplitude A. However, h_eq exhibits a non-monotonic dependence on frequency, f. There is an optimum frequency at which particles climb highest, and any further increase of frequency leads to a diminishment of this upwards motion. A phase diagram of particle movement is presented which shows that different zones of motion exist. This unique finding suggests that the mechanism of particle movement is caused by the creation and filling of voids under the tube. Particles cannot move upwards when the pipe insertion depth, h_in is <1.5 mm irrespective of how strong the supplied vibration is. In general, increasing h_in can improve climbing, but this effect falls with increasing levels of insertion depth until a saturation level is reached.

PACS number: 45.70.MG - granular flow

可以使粒状颗粒通过一根垂直插入振动的管道或部分克服重力的作用而向上移动，该管道或管道部分插入无粉状表面之下。这为运输散装物料提供了一种新方法。本文通过实验研究了管道的振动参数和插入深度对粒子运动的影响。发生粒子运动所需的最小振动幅度（A）和频率（f）是必需的。随着振幅A的增加，粉末的最终上升高度（h _eq）呈单调增加。但是，h _eq对频率f表现出非单调依赖性。存在一个最佳频率，在该频率下粒子会爬到最高处，并且频率的任何进一步增加都会导致这种向上运动的减弱。给出了粒子运动的相图，该图表明存在不同的运动区域。这个独特的发现表明，粒子运动的机制是由在管下形成和填充空隙引起的。当管道插入深度h _in <1.5 mm时，无论所提供的振动有多强，颗粒都不会向上移动。通常，增加h _in可以改善攀爬，但是这种影响会随着插入深度的增加而降低，直到达到饱和度为止。

PACS编号：45.70.MG-颗粒状流