Pointwise observations for rheological characterization using nuclear magnetic resonance imaging
Pointwise observations for rheological characterization using nuclear magnetic resonance imaging
复制标题
使用核磁共振成像进行流变表征的逐点观察
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
M. McCarthy
中科院分区：
文献类型：
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作者：
D. Arola;R. Powell;G. Barrall;M. McCarthy
本研究重点开发基于核磁共振 (NMR) 成像的粘度测量技术，使用脉冲梯度 NMR 来表征稳定管流条件下的流体材料。通过同时测量速度分布和压力梯度，可以局部表征复杂流体。剪切粘度-剪切速率数据，范围从一到二十多个剪切速率，来自于每单位管长度测量的一个组合速度分布/压降，提供了五种表现出牛顿和剪切稀化特性的流体。速度数据的分辨率控制测量的剪切粘度的精度，而径向分辨率规定剪切粘度-剪切速率数据点的数量和最小剪切速率。速度剖面测量具有 1 mm/s 的速度分辨率和径向分辨率，可提供 22 至 110 个空间分辨速度数据点，准确表征剪切速率大于……的流体。
This study focuses on development of a nuclear magnetic resonance (NMR) imaging based viscometric technique using pulsed gradient NMR for characterizing fluid materials under steady tube flow conditions. By simultaneously measuring velocity profiles and pressure gradients it is possible to characterize complex fluids locally. Shear viscosity–shear rate data, ranging from one to over two decades of shear rate from one combined velocity profile/pressure drop per unit tube length measurement, are provided for five fluids that exhibit both Newtonian and shear thinning characteristics. The resolution of the velocity data controls the accuracy of the measured shear viscosity whereas the radial resolution prescribes the number of shear viscosity–shear rate data points and the minimum shear rate. Velocity profile measurements with a velocity resolution of 1 mm/s and radial resolutions which provided from 22 to 110 spatially resolved velocity data points accurately characterized fluids for shear rates greater than...