Comment on: `Pipe Network Model for Scaling of Dynamic Interfaces in Porous Media'
M. Dube, M. Rost, K. R. Elder, M. Alava, S. Majaniemi, T. Ala-Nissila
Abstract
We argue that a proposed exponent identity [Phys. Rev. Lett 85, 1238 (2000)] for interface roughening in spontaneous imbibition is wrong. It rests on the assumption that the fluctuations are controlled by a single time scale, but liquid conservation imposes two distinct time scales.
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