磁粉的压实动力学
Compaction dynamics of a magnetized powder
摘要：
我们已经研究了实验的影响的颗粒之间的磁相互作用的颗粒堆提交给一系列的水龙头的压实动力学。用于进行这项研究的颗粒材料是金属和玻璃颗粒的混合物。将填料浸入均匀的外部磁场中。该磁场在金属颗粒之间引起相互作用，该相互作用构成可调内聚力。压实的特征时间和渐近包装分数已被测量为键数的函数，键数是内聚磁力和颗粒重量之间的比率。这些测量已经进行了不同分数的金属珠在桩。当堆体仅由金属颗粒组成时，特征压实时间随邦德数的平方根而增加。而渐近填充分数则随着Bond数的倒数而减小。对于混合物，当堆中磁化颗粒的分数增加时，特征时间增加，而渐近堆积分数减小。一个简单的介观模型的基础上形成的颗粒链沿磁场方向提出了解释所观察到的宏观性质的包装。
英文摘要：
We have investigated experimentally the influence of a magnetic interaction between the grains on the compaction dynamics of a granular pile submitted to a series of taps. The granular material used to perform this study is a mixture of metallic and glass grains. The packing is immersed in an homogeneous external magnetic field. The magnetic field induces an interaction between the metallic grains that constitutes the tunable cohesion. The compaction characteristic time and the asymptotic packing fraction have been measured as a function of the Bond number which is the ratio between the cohesive magnetic force and the grain weight. These measurements have been performed for different fractions of metallic beads in the pile. When the pile is only made of metallic grains, the characteristic compaction time increases as the square root of the Bond number. While the asymptotic packing fraction decreases as the inverse of the Bond number. For mixtures, when the fraction of magnetized grains in the pile is increased, the characteristic time increases while the asymptotic packing fraction decreases. A simple mesoscopic model based on the formation of granular chains along the magnetic field direction is proposed to explain the observed macroscopic properties of the packings.
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