無重力で水にバブを入れると動画

0:00
Here we have a large free sphere of water about the size of my head 130mm in diameter.
And we put a puff of air 10cc and 100msec radially-directed in from the side, and look at the result in waves.
And there's a combination of surface waves and body waves that go through the sphere.

0:27
We saw that in real time, now we see it in slow motion.

0:30
Starts off with the crater, sending a droplet off, and then the series of surface waves which come together at the end point or 180 degree point from the impact.

0:41
And these waves collapse back down, and now go across, the other side, towards the impact point.
And they continue until viscous force is damping things down.

0:52
At the light for interplay of both surface and body waves here.

1:08
Here we have a sphere of water, 75mm in diameter with an air-bubble inside, about 35mm in diameter, and we inject water dropplets anywhere from 1-8mm in diameter into the bubble.
And look at the result in collision dynamics where they collide with each other and the walls.

1:30
Most of the collisions result in an elastic collision, but every once in a while collision will result in a mass transfer across the interface.
And this mass transfer has a momentum exchange associated with it which will prepare the droplets.

1:44
Here a droplet is going in circular motion on the inside at the sphere until a mass transfer occurs _ _ pulsate off the surface.

2:04
Here's a sphere water 50mm in diameter with an effervenscent antacid tablet.
Bubbles form rapidly from a chemical reaction.

2:13
This is an example of heterogenious nucleation where bubbles form on the solid surface and again get a momentum exchange, and travel out in _ _ fluid.

2:33
The bubbles rapidly coalesce.
Once they reach a certain size, they seem to eat other bubbles at a faster rate.
That's going larger, and in this form of a bubble whirl, you end up with a bipolar situation with two large bubbles.

2:38
They rapidly eat all the other bubbles, and eventually you get a situation where one bubble dominates and all the other bubbles are pressed into an annular space.