Crucial role of sidewalls in granular surface flows: consequences for the rheology
Crucial role of sidewalls in granular surface flows: consequences for the rheology
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DOI：
10.1017/s0022112005005987
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发表时间：
2005-03
影响因子：
3.7
通讯作者：
P. Jop;Y. Forterre;O. Pouliquen
中科院分区：
文献类型：
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作者：
P. Jop;Y. Forterre;O. Pouliquen
在这篇论文中，我们研究了当颗粒物质从槽道中的静桩顶部的料斗中释放出来时，所产生的稳定的均匀流动。更具体地说，我们通过在不同宽度的设置中进行实验来关注侧壁的作用，从20个颗粒直径的窄通道到600个颗粒直径的通道。结果表明，桩上的定常流动完全由侧壁效应控制。理论模型考虑了壁面摩擦，并基于最近提出的适用于其他颗粒流构型的简单的局部本构关系，给出了与测量结果定量一致的预测。这一结果使我们对自由表面颗粒流的理解有了新的见解，并有力地支持了所提出的本构定律的相关性。
In this paper we study the steady uniform flows that develop when granular material is released from a hopper on top of a static pile in a channel. More specifically, we focus on the role of sidewalls by carrying out experiments in set-up of different widths, from narrow channels 20 particle diameters wide to channels 600 particle diameters wide. Results show that steady flows on pile are entirely controlled by sidewall effects. A theoretical model, taking into account the wall friction and based on a simple local constitutive law recently proposed for other granular flow configurations, gives predictions in quantitative agreement with the measurements. This result gives new insights into our understanding of free-surface granular flows and strongly supports the relevance of the constitutive law proposed.