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A wetting fluid is displaced at very low flow rate by a nonwetting fluid in a 250 000-duct, transparent, etched network. The structure formed by the injected fluid is ramified and the scale invariance is described by a measured fractal dimension 1. 80<D<1. 83. This value agrees with theoretical results of invasion percolation with trapping.
Lenormand et al. (Mon,) studied this question.
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