多孔介质中多脉冲PFG扩散测量的有效扩散时间

E.J. Fordham , P.P. Mitra , L.L. Latour
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引用次数: 30

摘要

导出了饱和液体多孔介质中多梯度脉冲扩散测量中有效扩散时间的表达式。这是必要的,因为扩散系数与时间有关。这些结果对于使用多重交替梯度方案的PFG扩散测量结果的定量解释是必需的,这种方案适用于大多数多孔系统。计算的本质和“平方”和“正弦”脉冲形状的结果之前已经出现,但没有推导。用户可能需要这种技术性计算的细节。
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Effective Diffusion Times in Multiple-Pulse PFG Diffusion Measurements in Porous Media

Expressions for the effective diffusion times in multiple-gradient pulse diffusion measurements in liquid-saturated porous media are derived. This is necessary since the diffusion coefficient is time dependent. The results are needed for quantitative interpretation of the results of PFG diffusion measurements using the multiple-alternating-gradient schemes which are preferred for the majority of porous systems. The essence of the calculation and the results for “square” and “sine” pulse shapes have appeared previously, but without derivation. The details of this somewhat technical calculation may be needed by users.

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