Yuetal. (2009) box-counted the solid and pore phases of a two-dimensional diffusion-limited aggregation (DLA) structure and observed linear relationships in the resulting log-log plots of the number of boxes (Nδ) versus box size (δ) over the same scale ranges for both phases. Based on this observation, Yu et al. (2009) proposed that “both the solid phase and pore phase could be fractal to form an apparent two-phase fractal porous medium in some range of statistically self-similarity.” However, we contend that the concept of a two-phase fractal porous medium is erroneous.

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The notion of...
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