A large‐scale field coaxial cylinder rheometer for the study of the rheology of natural coarse suspensions
A large‐scale field coaxial cylinder rheometer for the study of the rheology of natural coarse suspensions
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DOI：
10.1122/1.550693
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发表时间：
1995
影响因子：
3.3
通讯作者：
P. Coussot;J. Piau
中科院分区：
文献类型：
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作者：
P. Coussot;J. Piau
当想要直接研究粗悬浮液的行为时，需要一台具有宽间隙的特殊大型流变仪。作为理解粗悬浮液行为的第一步，构建了宽间隙同轴圆筒流变仪（1.2 m直径，0.2 m间隙，样品体积：0.5 m3）。这种装置应该是便宜和坚固的，被设计成在现场拖曳和使用，以测试包括直径不超过1厘米的颗粒的流体。然后检查假设的有效性和在用于测试粗悬浮液的宽隙流变仪的情况下流变计算的各种理论问题。这种几何形状的主要优点似乎是边缘效应不应该太重要。它的主要缺点，特别是对于具有复杂行为（屈服应力、触变性、粗颗粒的存在）的粗悬浮液，是从一个工具到另一个工具的剪切速率的不均匀性。各种天然材料的实验（水-粘土混合物）
When one wants to study the behavior of coarse suspensions directly, one needs a special large‐scale rheometer with a wide gap. As a first step towards the understanding of coarse suspension behavior a wide‐gap coaxial cylinder rheometer (1.2 m diameter, 0.2 m gap, sample volume: 0.5 m3) was built. This apparatus, which should be cheap and strong, was designed to be towed and used in the field to test fluids including particles whose diameters do not exceed 1 cm. The validity of hypotheses and the various theoretical problems of the rheometrical calculations in the case of a wide‐gap rheometer when used to test a coarse suspension are then examined. The main advantage of this geometry appears to be that edge effects should not be too important. Its main disadvantage, especially for coarse suspensions with a complex behavior (yield stress, thixotropy, presence of coarse particles), is the heterogeneity of shear rate from one tool to the other. Experiments with various natural materials (water–clay mixtures...