Abstract
The formation and rupture of gas film in the process of formation, rupture and coalescence of antibubbles were investigated by high-speed photography. It was found that a gas film will appear and wrap a droplet when the droplet hit a layer of liquid film or foam before impacting the gas-liquid interface. The gas film may survive the impact on the gas-liquid interface and act as the gas film of an antibubble. A multilayer droplet will be formed when the droplet hits through several layer of liquid films, and a multilayer antibubble will be formed when the multilayer droplet impact a gas-liquid interface or a single layer of foam on the liquid surface. The way to generate antibubbles by liquid films will undergo the formation and rupture of gas films. The coalescence of two antibubbles, which shows a similar merging process of soap bubbles, also undergo the rupture and formation of gas films. The rupture of gas film of antibubble caused by aging and impact is also discussed.
Highlights
Antibubbles are unusual fluid objects in the liquid
When droplets pass through several layers of liquid film and fall on the liquid surface or fall on a single layer of foam, multi-layer antibubbles enveloped by several layers of gas film and several layers of liquid film may form under water
The research focuses on the interaction between antibubble and film in these physical processes
Summary
Antibubbles are unusual fluid objects in the liquid. An antibubble is a thin spherical gas film containing and being surrounded by a liquid, which is completely opposite to the soap bubble structure.
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