科研之友
微信
新浪微博
Facebook
分享链接
摘要
High-resolution fast imaging reveals that imbibition fronts driven at constant flow rate (mean velocity v) and roughened by capillary forces move by local avalanches -spatial clusters of large local velocity. Our measurements show that the lateral extents, amplitudes and durations of the avalanches are power-law distributed, with an exponentially decaying cutoff related to the lateral correlations of the interface. As the value of v is systematically reduced the exponential cutoffs diverge, suggesting the presence of a critical pinning transition at v=0. We verify that the measured statistical distributions (specifically the power-law exponents and the divergence of the exponential cutoffs as v-->0) fulfill a number of scaling relations expected to hold for slowly driven systems close to a depinning transition.
- 出版日期2011-5
