Speaker
Description
The water percolation threshold in porous media represents the critical saturation where fluid transitions from isolated clusters to a connected network, which is vital for transport in porous media. Traditional approaches to determine this threshold rely on laboratory experiments and empirical fitting. Percolation theory offers a theoretical foundation for locating this threshold in an ideal, randomly occupied, and infinite system. Real porous media, however, are constrained by solid skeletons and interfacial physics, including surface tension and wettability. Here, we first evaluate porosity and geometrical impacts, revealing that solid matrices elevate the threshold. Then, by simplifying the media into single- meniscus units, we derive lower and upper bounds for the threshold as a function of wettability and meniscus coordination number. Statistical analyses based on X-ray CT experiments and pore scale observations support these bounds. This work offers new physics insights into explaining the critical saturation for connectivity in porous media.
| Country | China |
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