Nonlocal dynamics of spontaneous imbibition fronts

Nonlocal dynamics of spontaneous imbibition fronts

We have studied spontaneous imbibition fronts generated by capillary rise between two roughened glass plates, the separation d of which varied between 10 and 50 microm. Perfect agreement with Washburn's law was obtained. We have determined the roughness exponent chi of the fronts, and found chi...

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Veröffentlicht in:Physical review letters 2002-09, Vol.89 (10), p.104503-104503, Article 104503
Hauptverfasser: Geromichalos, Dimitrios, Mugele, Frieder, Herminghaus, Stephan
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Mugele, Frieder
Herminghaus, Stephan
description We have studied spontaneous imbibition fronts generated by capillary rise between two roughened glass plates, the separation d of which varied between 10 and 50 microm. Perfect agreement with Washburn's law was obtained. We have determined the roughness exponent chi of the fronts, and found chi=0.81+/-0.01 for small length scales. Above a certain crossover length xi, it reached chi=0.58+/-0.04, as predicted by the quenched noise Kardar-Parisi-Zhang equation. The crossover length is found to scale with the plate separation as sqrt[d], as predicted by recent models which properly include nonlocal dynamics effects on the front. We believe this to be the first clear identification of crossover from nonlocal to local dynamics.
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title Nonlocal dynamics of spontaneous imbibition fronts
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