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arXiv 1808.04342cond-mat.soft
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干球填料与湿球填料的结构相似性

Structural similarity between dry and wet sphere packings

Simon Weis, Gerd Schröder-Turk, Matthias Schröter

摘要:

颗粒材料的机械性能在润湿液体的存在下显著改变,润湿液体在颗粒之间产生毛细桥。在这里,我们证明,使用X射线断层扫描的干和湿球填料,这种机械性能的变化并不伴随着填料之间的结构差异。我们通过每个球$\langle Z\rangle$的平均接触数和颗粒的Voronoi细胞的形状各向同性$\langle β_0^{2,0} \rangle$来表征后者。此外,我们表明,每球$\langle B\rangle$的液体桥的数量约等于$\langle Z\rangle + 2$,独立的体积分数的包装。这些发现将有助于指导湿颗粒物质的颗粒模型和连续介质力学描述的发展。

英文摘要:

The mechanical properties of granular materials change significantly in the presence of a wetting liquid which creates capillary bridges between the particles. Here we demonstrate, using X-ray tomographies of dry and wet sphere packings, that this change in mechanical properties is not accompanied by structural differences between the packings. We characterize the latter by the average numbers of contacts of each sphere $\langle Z\rangle$ and the shape isotropy $\langle β_0^{2,0} \rangle$ of the Voronoi cells of the particles. Additionally, we show that the number of liquid bridges per sphere $\langle B\rangle$ is approximately equal to $\langle Z\rangle + 2$, independent of the volume fraction of the packing. These findings will be helpful in guiding the development of both particle-based models and continuum mechanical descriptions of wet granular matter.

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