The Saffman-Taylor fingering instability was formed in a Hele-Shaw cell (a narrow space between parallel plates) as red India ink was injected into the more viscous Tide laundry detergent.

The Saffman-Taylor fingering instability was formed in a Hele-Shaw cell (a narrow space between parallel plates) as red India ink was injected into the more viscous Tide laundry detergent.

By Janelle Montoya and Gardner Nichols for Fall 2015 Team Second.
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A water balloon is struck by a BB gun. The balloon unzips, water jets forward and back along the BB track, and then the bulk of the water falls.
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Bubbles rather than fingers are formed when air is injected into red ink in a Hele Shaw cell.

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