Is the leftover beverage bottle still there yesterday?Come in and watch the water droplets!| Play

Maybe classmates have encountered such a phenomenon occasionally?

When the water pillar of the faucet splashes into the sink,

There are a few small water droplets flying quickly along the water,

Like water droplets dripped in a hot pot;

Or when you hit the barrel wall of the barrel with your fingers, you can see some erratic water balls.

Today we will use a beverage bottle to experiment ~

experiment equipment

Bid cups, various beverage bottles, detergent, ruler

experiment procedure

First of all, we just bring a bottle of drink

Drink a little

Hold it at the bottle cap with one hand

The other hand hit the position of about one centimeter below the liquid surface with a ruler

Hi! Hi Hi Hi!

Native

Nothing happened, it seems that I just foamed the bubbles in the air in the water.

When knocking, the feeling of power is dispersed by the curved bottle wall

Let's try it with a square beverage bottle

It is just a liquid in the bottle to facilitate observation

Hi!

Ohhhhh ~

Although it is short, you can still see water drops of different sizes

The bubbles that you see when you see it are completely different

They not only exist above the liquid surface

And very active

Then use a square bottle to install some colorful carbonated drinks

still the same,

Aiming at a little bit below the liquid, knock!

Sure enough, the air -containing drink is still better

Not only is there a large number of water droplets and a long duration

There are all kinds of interesting interactions

For such a powerful carbonated drink

In fact, change back to the round bottle

If the diagonal surface brought by the diameter changes is used to hit the liquid surface

It can also play a certain effect

When I tried various liquids

I found that the water with a small amount of detergent was tapped slightly

It can arouse a lot of small water droplets

(You can distinguish the water beads and bubbles through the refraction pattern of light

The thin film of the bubble will produce a rainbow -like interference stripe

The lens phenomenon of water ball is particularly obvious)

But the little water droplets here are not as good as a straight sprint as before before

Instead, I like to gather together

Their principles are also different from the previous

Original understanding

Regarding the phenomenon of water droplets briefly on the water surface without fusion with the water body, scientists have tried to explain from the end of the 19th century. Since the 21st century, scientists have different interpretations of the temporary reserved water beads formed under different conditions, such as flowing water on the water surface, water vibration up and down, water droplets and water body differences, and so on. However, the same places in the same place are flowing air layers between the water droplets and the water surface, and this layer of air not only supports the water droplets to prevent them fall into the water body, but also drives the water droplets to move forward. In a closer work [1], the research team proves that the small water droplets floating on the static water will slowly rotate, and the advancement of the water droplets has nothing to do with the surface wave generated by the water surface. Air flow is dominated. In other documents, there are more than 10 microns of the air layer in other literatures, so the naked eye is almost invisible.

And if you want to knock out small water droplets in the beverage bottle, you need a suitable force point and power surface: first of all, this tap can cause the water to vibrate as much as possible, so that you can knock out smaller water droplets; Secondly, by knocking on the edge of the square water bottle, the force of the knocking can be better passed to a part of the surface of the water, so that part of the water at the surface of the surface to turn into small water droplets. Or for a circular beverage bottle, the liquid surface can be controlled in a funnel -shaped area where the radius gradually becomes larger, so that a upward force can be given to the water droplets when knocking.

For the choice of liquid, I found that carbonated beverages are most likely to form small water droplets on the surface under the trial of many times, and the gas -containing water is used. Ordinary pure water needs to be tried many times to observe small water droplets. The editor speculates that when hitting the bottle body, the reinity of the gas in the liquid may promote the formation of the flowing air layer under the water droplet, so the phenomenon when using a very unstable carbonated drink with dissolved gases is the most obvious.

Of course, at the end, Xiaobian used a small amount of water with a small amount of detergent to create a large amount of small water droplets, but the principle of these small water beads was different from those above. These small water droplets and water on the water are "inserted" and some hydrophilic molecules on one side, so the reprimand between the exposed hydrophobic groups holds the small water droplets. However, because these small water beads are not entrusted by the flowing air layer, they do not have a tendency to move at high speed, so they will be reunited. In contrast, the small water droplets driven by air are more interesting ~

references

[1] K. Law and H.-Y. Chu, "Bowling Water Drops on Water Surface," PHYS. Fluids 31, 067101 (2019).

[2] C. Pirat, L. Lebon, F.Antoine, J.-S. Roche, and L. Limatm, “Gyroscopicinstability of a drop trapped inside an inclined circular hydraulic jump,”Phys. Rev. Lett.105, 084503 (2010).

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