Fluctuations in viscous fingering

Details Fluctuations in viscous fingering Fluctuations in viscous fingering

2001-06-27

arxiv.org/abs/cond-mat/0106580v2

Phys Rev E 65, 030601 (2002).

Physics

Condensed Matter

Soft Condensed Matter

Revised introduction, smoothed transitions in paper body, and added a few additional minor results. (Figures unchanged.) 4 pag

Scientific paper

10.1103/PhysRevE.65.030601

Our experiments on viscous (Saffman-Taylor) fingering in Hele-Shaw channels reveal finger width fluctuations that were not observed in previous experiments, which had lower aspect ratios and higher capillary numbers Ca. These fluctuations intermittently narrow the finger from its expected width. The magnitude of these fluctuations is described by a power law, Ca^{-0.64}, which holds for all aspect ratios studied up to the onset of tip instabilities. Further, for large aspect ratios, the mean finger width exhibits a maximum as Ca is decreased instead of the predicted monotonic increase.

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