MRI用新型圆柱剪切仪研究颗粒界面流变
MRI investigation of granular interface rheology using a new cylinder shear apparatus
摘要：
通过质子磁共振成像研究了界面附近颗粒材料的流变特性。一个新的圆筒剪切装置已被插入到MRI设备中，它允许控制由外壁施加在颗粒上的径向围压和测量内剪切圆筒上的扭矩。一个多层测速序列已开发的同时测量的速度分布在不同的样品区，而固体分数分布的测量是基于静态成像的样品。本文研究了剪切界面粗糙度和横向围壁粗糙度对颗粒界面流变性的影响。
英文摘要：
The rheology of granular materials near an interface is investigated through proton magnetic resonance imaging. A new cylinder shear apparatus has been inserted in the MRI device, which allows the control of the radial confining pressure exerted by the outer wall on the grains and the measurement of the torque on the inner shearing cylinder. A multi-layer velocimetry sequence has been developed for the simultaneous measurement of velocity profiles in different sample zones, while the measurement of the solid fraction profile is based on static imaging of the sample. This study describes the influence of the roughness of the shearing interface and of the transverse confining walls on the granular interface rheology.
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