Rheometry and detection of apparent wall slip for Poiseuille flow of polymer solutions and particulate dispersions by nuclear magnetic resonance velocimetry
Rheometry and detection of apparent wall slip for Poiseuille flow of polymer solutions and particulate dispersions by nuclear magnetic resonance velocimetry
复制标题
通过核磁共振测速仪对聚合物溶液和颗粒分散体的泊肃叶流进行流变测定和表观壁滑移检测
DOI：
10.1122/1.550752
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发表时间：
1996
影响因子：
3.3
通讯作者：
S. Ablett
中科院分区：
文献类型：
--
作者：
S. Gibbs;K. L. James;L. Hall;D. Haycock;W. Frith;S. Ablett
开发了一种灵活而稳健的基于核磁共振（NMR）的毛细管流变法。该技术的精度进行了探讨，特别是关于测量的表观壁面滑移速度的能力。替代NMR流变仪协议的实际意义进行了讨论方面的鲁棒性和速度。给出了牛顿流体（50.4%蔗糖水溶液）、剪切稀化溶液（0.2%黄原胶水溶液）和由5-50 μm不规则软琼脂凝胶颗粒组成的颗粒体系的NMR流变测定结果。在所有情况下，在4 mm i.d.，玻璃毛细管通过NMR测速法测量径向速度分布;径向微分提供剪切速率值，其已经通过相关的径向位置和测量的压降进行缩放以确定粘度作为剪切速率的函数。与锥板或平行板流变仪的一致性已为每个系统建立。
A flexible and robust approach to nuclear magnetic resonance (NMR) based capillary rheometry has been developed. The precision of the technique has been explored, with particular regard to the capability for measurement of apparent wall slip velocities. The practical implications of alternative NMR rheometry protocols are discussed with regard to robustness and speed. NMR rheometry results are presented for a Newtonian fluid (aqueous 50.4% sucrose), a shear thinning solution (0.2% aqueous xanthan gum), and a particulate system composed of 5–50 μm irregular, soft agar gel particles. In all cases, fully developed Poiseuille flow was studied in a 4‐mm‐i.d., glass capillary. Radial velocity profiles were measured by NMR velocimetry; radial differentiation provides shear rate values, which have been scaled by the associated radial positions and measured pressure drops to determine viscosity as a function of shear rate. Agreement with cone‐and‐plate or parallel plate rheometry has been established for each syst...