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Study of Dispersion in Porous Media by Pulsed Field Gradient NMR: Influence of the Fluid Rheology

机译:脉冲场梯度NMR在多孔介质中的分散性研究:流体流变学的影响

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Pulsed field gradient nuclear magnetic resonance (PFG-NMR) is used to measure the molecular displacements for the flow of a fluid through a capillary tube and a packed bed made of monodisperse PMMA beads. The molecules average displacement is studied using both the formalism of propagators and the cumulant method. In the Poiseuille case, the dispersion coefficients determined by the cumulant method compare satisfactorily with the theoretical values obtained. The technique is then extended to study the flow through a porous medium. We thus analyze Newtonian (water) and non-Newtonian (Xanthan) flows and put a particular emphasis on comparing the dispersion mechanisms between Newtonian and non-Newtonian fluids.
机译:脉冲场梯度核磁共振(PFG-NMR)用于测量通过毛细管和由单分散PMMA珠制成的填充床的流体流动的分子位移。分子的平均位移是使用传播子的形式学和累积量方法研究的。在Poiseuille情况下,通过累积量法确定的色散系数与获得的理论值令人满意。然后将该技术扩展到研究通过多孔介质的流动。因此,我们分析了牛顿流体(水)和非牛顿流体(黄原)的流动,并特别着重于比较牛顿流体与非牛顿流体之间的扩散机理。

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