论文标题
振动的优质柱的破裂引起的流体化
Fracturing-induced fluidization of vibrated fine-powder column
论文作者
论文摘要
我们通过实验研究垂直振动对由直径5微米的玻璃珠组成的细粘性粉末脆性行为的影响。这是一种尝试了解振动在流化Geldart的C组粉末中的唯一作用，该粉末以在流化时构成困难而闻名。我们发现，可以通过增加外部振动的强度来压实，破裂并有效地将内聚粉末柱被压实，破裂并有效地流动。在完整的实验相图中总结了振动引起的破裂的过程，该过程显示了振动粉末柱的四个不同阶段：固结（CS），静态断裂（SF），动态断裂（DF）和对流裂缝（CF）。 We find that the boundary separating the consolidated and fracture regimes depends on the dimensionless shaking strength, S. However, in the DF regime, the decompaction wave propagation speed normalized to gravitational speed is found to be independent of S. In order to reach our ultimate goal of effective fluidization of group C powders, we explore geometrical parameters like container shapes, sizes, and base conditions.我们发现，具有半球基底条件的圆柱是最有效的容器，以便在振动时实现有效的C组粉末的流体化。
We experimentally investigate the effect of vertical vibrations on the brittle behavior of fine cohesive powders consisting of glass beads of 5 microns in diameter. This is an attempt to understand the sole role of vibrations in fluidizing Geldart's group C powders, which is known for posing difficulty while fluidization. We find that the cohesive powder column can be compacted, fractured, and effectively fluidized by increasing the strengths of external vibrations. This process of vibration-induced fracturing is summarized in a full experimental phase diagram showing four distinct phases of the vibrated powder column: consolidation (CS), static fracture (SF), dynamic fracture (DF), and convective fracture (CF). We find that the boundary separating the consolidated and fracture regimes depends on the dimensionless shaking strength, S. However, in the DF regime, the decompaction wave propagation speed normalized to gravitational speed is found to be independent of S. In order to reach our ultimate goal of effective fluidization of group C powders, we explore geometrical parameters like container shapes, sizes, and base conditions. We find that the circular cylinder with hemispherical base condition is the most effective container in order to achieve effective fluidization of group C powders when vibrated.
