The effect of displacement distribution asymmetry on the accuracy of phase-shift velocimetry in porous media

The effect of displacement distribution asymmetry on the accuracy of phase-shift velocimetry in porous media
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多孔介质中位移分布不对称性对相移测速精度的影响

DOI:
10.1016/j.micromeso.2017.11.048
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发表时间:
2018
影响因子:
5.2
通讯作者:
Vallatos A
Vallatos A
中科院分区:
材料科学2区
文献类型:
--
作者:
Vallatos A

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脉冲磁场梯度实验提供的相移测速技术是目前速度最快的磁共振测速技术。然而,在研究多孔介质中的流动时,已经报道了关键问题。这些导致不准确的测速结果,没有明确的解释出现。在这项工作中,我们调查的影响,在体素内位移的准确性相移测速分布的不对称性。这与通过多孔介质的流动特别相关,其中已知存在停滞孔或差流会导致不对称的位移分布。在这里,定制的体素内分布是使用一个简单的体模结合一个单一的大体素。结合实验结果与模拟,我们表明,在多孔材料的研究中常见的体素内位移分布的不对称性的存在下,可能会导致重要的测速误差。
Phase-shift velocimetry provided by pulsed magnetic field gradient experiments is the fastest magnetic resonance technique for measuring velocity. However, critical issues have been reported when studying flow through porous media. These lead to inaccurate velocimetry results, with no clear explanation emerging. In this work we investigate the effect of asymmetries in the distribution of intra-voxel displacements on the accuracy of phase-shift velocimetry. This is particularly relevant to flow through porous media, where the presence of stagnant pores or differential flow is known to result in asymmetric displacement distributions. Here, tailored intra-voxel distributions are achieved using a simple phantom combined with a single large voxel. Combining experimental results with simulations, we demonstrate that the presence of asymmetries in the intra-voxel displacement distributions, common in studies of porous materials, can lead to important velocimetry errors.
多孔介质中流速的核磁共振成像
DOI: 10.1002/aic.690450302
发表时间: 1999
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