Pressure-dependent scaling scenarios in experiments of spontaneous imbibition

Year: 2007
  • Planet, R.
  • Pradas, M.
  • Hernández-Machado, A.
  • Ortín, J.
Journal: Physical Review E Volume: 76
Pages: 056312-1-056312-7
ISSN: 1539-3755
The scaling properties of the rough liquid-air interface formed in the spontaneous imbibition of a viscous liquid by a model porous medium are found to be very sensitive to the magnitude of the pressure difference applied at the liquid inlet. Interface fluctuations change from obeying intrinsic anomalous scaling at large negative pressure differences, to being super-rough with the same dynamic exponent z3 at less negative pressure differences, to finally obeying ordinary Family-Vicsek scaling with z2 at large positive pressure differences. This rich scenario reflects the relative importance on different length scales of capillary and permeability disorder, and the role of surface tension and viscous pressure in damping interface fluctuations.
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