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The dynamics of granular materials ― towards grasping the fundamentals

机译：粒状材料的动力学-掌握基本原理

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摘要

The manufacture of a wide range of materials in particulate form currently has to rely upon a design basis that is not at all strong theoretically. The most developed methods exist in the design of storage vessels for particles but many weaknesses remain. In those areas of processing concerned with the development of product properties, the knowledge of the dynamics of granular motion is more rudimentary. However, we are now in a position where progress of a fundamental character elucidating the mechanisms operating in engineering systems can now be undertaken. This is illustrated by recent studies aimed at understanding how the axial motion of particles occurs in mixers which the particles are stirred mechanically by blades. Representation is possible in terms of an axial diffusion coefficient, for instance. A more physical approach reveals a cellular structure to the flow with transfers between cells limiting behaviour. The axial limits of these cells correspond to the plane of rotation of ploughshare blades or of the mechanical supports for long flat blades.
机译：目前，制造各种形式的颗粒材料必须依靠理论上根本不强的设计基础。在用于颗粒的存储容器的设计中存在最先进的方法，但是仍然存在许多缺点。在那些与产品性能发展有关的加工领域中，关于颗粒运动动力学的知识更为初级。但是，我们现在处于可以阐明工程系统中运行机制的基本特征的位置。旨在了解颗粒在混合器中如何发生颗粒轴向运动的最新研究表明了这一点，该混合器中的颗粒通过叶片进行机械搅拌。例如，可以根据轴向扩散系数来表示。一种更物理的方法揭示了一种流动的细胞结构，其中细胞之间的转移限制了行为。这些单元的轴向极限对应于犁share式叶片或长型扁平叶片的机械支撑的旋转平面。

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