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Modal behavior observed in the evolution of immiscible interfaces within an injection-forced Hele-Shaw cell.

A series or experiments has been performed on a horizontally oriented, rectangular Hele-Shaw cell. Air was injected in the middle of one of the short sides of the cell into the silicon oil contained between the glass plates of the cell. The resulting unstable, immiscible interface resulted in a series of fingering patterns that were photographed and digitized. A variety of analytical techniques was applied to the images in order to quantify the observed phenomena