Donut-Shaped Bubbles

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Here researchers simulate rain-like droplet impacts with large drops of water falling into a tank from several meters.  The momentum of such an impact is significantly higher than many other droplet impact examples we’ve featured. In this case, the coronet, or crown-like splash, caused by the collision collapses quickly, closing the fluid canopy around a trapped bubble of air.  The remains of the coronet fall inward, preventing the development of the usual Worthington jet associated with droplet impacts.  Instead, the air bubble takes on an unstable donut-like shape. (Video credit: M. Buckley et al.)

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