Anomalous roughening of viscous fluid fronts in spontaneous imbibition.

  title={Anomalous roughening of viscous fluid fronts in spontaneous imbibition.},
  author={Jordi Soriano and A Mercier and Ramon Planet and A Hernandez-Machado and Miguel A. Rodriguez and Jordi Ort{\'i}n},
  journal={Physical review letters},
  volume={95 10},
We report experiments on spontaneous imbibition of a viscous fluid by a model porous medium in the absence of gravity. The average position of the interface satisfies Washburn's law. Scaling of the interface fluctuations suggests a dynamic exponent z approximately 3, indicative of global dynamics driven by capillary forces. The complete set of exponents clearly shows that interfaces are not self-affine, exhibiting distinct local and global scaling, both for time (beta = 0.64 +/- 0.02, beta… CONTINUE READING