Steadily oscillating axial bands of binary granules in a nearly filled coaxial cylinder
Steadily oscillating axial bands of binary granules in a nearly filled coaxial cylinder
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在几乎充满的同轴圆柱体中稳定振荡的二元颗粒轴向带
DOI：
10.1103/physreve.91.010201
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发表时间：
2015
影响因子：
2.4
通讯作者：
and Kenichi Yoshikawa
中科院分区：
文献类型：
--
作者：
Shio Inagaki;Hiroyuki Ebata;and Kenichi Yoshikawa
与预期的混合相反，颗粒状材料通常在机械搅拌（例如流动、摇动或旋转）下分离。众所周知，在部分填充的旋转圆柱体中，颗粒材料的双分散混合物表现出分离的单调粗化动力学。本文报道了在近满同轴圆柱的定常旋转下，轴向分离带的定常振荡。轴向带显示出沿旋转轴沿着稳定的来回运动。实验结果表明，这些轴向带动力学驱动的全球对流整个系统。时空动力学的基本特征再现了一个简单的唯象方程，其中包括全球对流的影响。
Granular materials often segregate under mechanical agitation such as flowing, shaking, or rotating, in contrast to an expectation of mixing. It is well known that bidisperse mixtures of granular materials in a partially filled rotating cylinder exhibit monotonic coarsening dynamics of segregation. Here we report the steady oscillation of segregated axial bands under the stationary rotation of a nearly filled coaxial cylinder forrevolutions. The axial bands demonstrate steady back-and-forth motion along the axis of rotation. Experimental findings indicated that these axial band dynamics are driven by global convection throughout the system. The essential features of the spatiotemporal dynamics are reproduced with a simple phenomenological equation that incorporates the effect of global convection.