Abstract
We report an experimental and theoretical study of wetting front propagation in anisotropic paper. The height-height correlation function is measured in the presence of large scale biasing and is found to scale with an exponent χ = 0.4. Theoretical analysis of this two-dimensional invasion predicts logarithmic scaling for isotropic paper. The observed nonzero roughness is due to correlated randomness and anisotropy in the paper.
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