Transient peristaltic transport of grains in a liquid

Transient peristaltic transport of grains in a liquid
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液体中谷物的瞬时蠕动运输

DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
M. Ramaioli
M. Ramaioli
中科院分区：
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文献类型：
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作者：
Marco Marconati;S. Rault;Farshad Charkhi;A. Burbidge;J. Engmann;M. Ramaioli

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泵送悬浮液和膏体在许多情况下一直是一项重大的技术挑战 从食品加工到采矿的各种工业应用。蠕动泵已经成为流行的 泵送和/或添加复杂的流体，因为它们的坚固性。在有蠕动的悬浮液输送过程中 对于泵，可能会出现堵塞问题，特别是在瞬变操作期间。这是一个特别令人担忧的问题。 只要间歇地使用泵送装置，仅在需要时才产生流量。进一步了解 这类系统的瞬变动力学以及可能导致干扰的条件将导致 更坚固的蠕动泵设计。为了实现这些目标，一种简化定子转子的实验装置 使用了蠕动软管泵的组装。在这种装置中，滚子将动量传递给液体 在施加恒定负载时的悬架。记录了滚子速度的演变过程 不同浓度、不同直径的单分散微球。人们发现，这种流动并不强烈 取决于分散颗粒的体积分数，如果悬浮相的尺寸与 软管直径。相反，当它们的尺寸很小，并且颗粒很小时，流动会强烈减慢。 浓度提高了。这些发现有助于改进蠕动泵的设计。 给出软管的直径和要运输的颗粒的直径，确定合适的尺寸。
Pumping suspensions and pastes has always been a significant technological challenge in a number of industrial applications ranging from food processing to mining. Peristaltic pumps have become popular to pump and/or dose complex fluids, due to their robustness. During the transport of suspensions with peristaltic pumps, clogging issues may arise, particularly during transient operations. That is a matter of particular concern whenever the pumping device is used intermittently to generate flow only on demand. Further understanding of the transient dynamics of such systems and of the conditions that can lead to jamming would result in more robust peristaltic pump design. To achieve these goals, an experimental setup that simplifies the statorrotor assembly of a peristaltic hose pump was used. In this setup, a roller transfers momentum to a liquid suspension, upon application of a constant load. The evolution of the velocity of the roller was recorded for different concentrations of mono-dispersed spheres of different diameters. The flow is found not to be strongly dependent on the dispersed particle volume fraction, if the size of the suspended phase is comparable with the hose diameter. Conversely, the flow is strongly slowed down when their size is small and the particle concentration is increased. These findings could help improving the design of peristaltic pumps by a more appropriate sizing, given the diameter of the hose and that of the particles to be transported.