Questions tagged [bubbles]
A coherent region of fluid embedded in a fluid with different properties (air in water) or a coherent region of fluid surrounded by a membrane embedded in a fluid which may or may not be different (such as air in a soap membrane).
204 questions
0
votes
0
answers
11
views
Difference between Pressure Jump and Pressure Gradient in multiphase flow, and Relationship between them
Assuming we have a multiphase flow (maybe a bubble immersed in water) with interface separating between the two phases. The interface is defined with a certain surface tension. Due to the liquid ...
0
votes
0
answers
15
views
Why does air bubbles form when it is poured on another liquid surface [duplicate]
Reason behind the formation of air bubbles .
Force dynamics bw water and air
And how long does it take the air bubbles to pop and what factor the popping depends.
1
vote
1
answer
38
views
Formation of bubbles on the water surface
So I noticed it a few days back that when a streamlined flow of water from a tap falls on a water surface you don't get any bubble at the point of contact but the moment I place the water surface ...
- 8,456
0
votes
0
answers
35
views
Pressure inside a bubble/drop of water due to surface tension
I was studying problems in capillary action in fluid mechanics and I have a fundamental doubt. Is the excess pressure inside a bubble/spherical fluid body caused by surface tension, the same all ...
- 19
1
vote
0
answers
63
views
How to calculate pressure necessary to push air bubble out of capillary [closed]
An air bubble is kept by surface tension at the bottom of a capillary. The capillary is sealed at the bottom, where the air bubble sits.
How to calculate the pressure necessary to push the air bubble ...
- 11
1
vote
1
answer
66
views
What would happen to a soap bubble if there were no surface tension?
Suppose you have a soap bubble. Now, suppose that the surface tension in the liquid film that surrounds the bubble disappears instantly. What would happen to the bubble? Also, is it possible to form a ...
2
votes
1
answer
74
views
Why does a bubble created in the body of a liquid pop when it rises to the surface?
Suppose you have a glass of water and you blow bubbles in the water using a straw. The bubbles pop when they rise to the surface of water. Why does this happen? Does the surface tension of water play ...
6
votes
1
answer
155
views
How do bubbles on water surface merge?
When we open a tap over a water surface, we get to see a lot of bubbles ("half merged in the water") coming out on the surface.
Now what I saw was that two such nearby half bubbles merge to ...
- 8,456
1
vote
1
answer
51
views
Why are water bubbles created at the top of the bottle if the water level is higher?
Water bubbles created at the top of the bottle if the water level is higher:
but water bubbles is not created at the top of the bottle if the water level is lower:
This question is very different ...
- 113
6
votes
1
answer
140
views
How does a bubble pop?
I was looking at some old slow motion videos showing a phenomenon where a bubble is popped by firing a sphere (or pea) through it.
One obvious thing that happens is that the pea does not pop the ...
- 1,433
0
votes
0
answers
43
views
Inverting a bubble interface to recover the level set function
I have access to some high quality CFD data that includes 2D and 3D level set functions for simulations of bubbles. Masking the level set function using a heaviside is easy and it is a fast way to get ...
- 1
4
votes
4
answers
2k
views
How are curved soap films stable?
How do curved soap films remain in equilibrium, if surface tension tries to pull them taut?
What I understand:
Surface tension acts tangentially on a surface.
The potential is energy is proportional ...
2
votes
1
answer
120
views
What are Bubbling Geometries?
I know that Wilson loops in certain higher rank representations are dual to Bubbling Geometries. Also, certain local operators are dual to this kind of solutions. But (independently from holography), ...
1
vote
1
answer
90
views
Potential energy of a gas lighter than air
Here is the situation. Let's say I have have a mass of a given liquid and I heat it to create a gas. The gas has a lower density than air, so it will move higher and higer in the atmosphere. Then, I ...
- 33
1
vote
0
answers
117
views
How are bubbles formed when a raindrop hits a flat pool of water?
I have noticed that raindrop impact can create a bubble on the surface of the water in a hot tub (104°F) up to several centimeters in diameter that is stable for several seconds before bursting.
The ...
- 2,414
1
vote
0
answers
28
views
Electron as a wave function, is it a wave bubble? [closed]
Something I have been pondering.
We tend to think of a physical particle as a grain of sand or at atomic levels maybe an electron(lepton).
If I now choose to consider an electron as a wave, typically ...
- 11
15
votes
1
answer
792
views
In beer, why do bubbles travel faster upwards in the center?
This is a very odd question, but I just so happened to be observing a pint of beer and realized that the bubbles floating up seemed to travel faster towards the center of the glass than towards the ...
- 153
1
vote
0
answers
133
views
Can real particles be created from a false vacuum spontaneously through decay?
Consider false vacuum decay.
Given the energy difference between the false to true,
Can this process lead to the creation of real particles as well as the vacuum bubbles?
- 501
2
votes
1
answer
78
views
Why does light always make a rainbow on the surface of a bubble?
When light is refracted through little drops of water the rainbow is formed behind the water molecules.
When light is refracted through a glass prism the rainbow is formed inside the prism.
Then why ...
- 422
0
votes
2
answers
74
views
Bubble phenomenon
A few days ago I encountered a problem that caught my attention:
The surface of an air bubble oscillates at a frequency of $20$ kHZ. We
observe that this oscillation causes another air bubble nearby ...
1
vote
2
answers
619
views
Bubbles formed in standing water in glass
I kept a cold standing water in a glass for a while to warm it up. After a while I returned to see that small minute bubbles have formed in the glass. On closer inspection, the bubbles seem to not ...
- 2,062
0
votes
1
answer
89
views
Why is this the "no bubbles" condition?
I'm reading through the "Waves" textbook from the Berkley series. In section 7.3, water waves are described. First, the condition that water is incompressible is derived as follows (assuming ...
- 3,410
1
vote
1
answer
173
views
Calculating the pressure inside catenoid formed using soap film?
Soap film will not readily form a cylinder, instead, it will form a catenoid if it's circular faces are flat. I know that this happens to minimise surface area.
But how to prove that this provides the ...
0
votes
0
answers
54
views
Necking stage in bubble detachment
The first image is the bubble dynamics in nucleate boiling, in a) you can see that the bubble is detaching by minimizing contact line with surface until zero, while in b) the bubble is enlongate and ...
5
votes
1
answer
72
views
What is the explanation for the structure of foam?
When you look at any gas in liquid foam, you'll see a particular structure.
You'll find that the structure consists of some bigger bubbles along with some smaller and smaller ones.
I would like to ...
- 51
0
votes
1
answer
117
views
Surface tension in a bubble
In a bubble or liquid droplet how is tangential surface tension force assumed to be balanced by perpendicular pressure force?
- 1
2
votes
2
answers
552
views
Why does bubble formation only happens at the point when vapor pressure becomes equal to atmospheric pressure during boiling?
I am a high school student and I am very confused about what's actually happening at the microscopic scale in an ideal solution when it's boiling?
Boiling as I understand at microscopic level is- ...
- 39
1
vote
0
answers
32
views
What would happen if a true vacuum expanded within the event horizon of a black hole? [duplicate]
If a bubble of a false vacuum decaying to a true vacuum state (in one of the fields described by the Standard Model) somehow expanded starting from a point within the event horizon of a black hole, ...
- 111
4
votes
2
answers
340
views
Why doesn't a frothing drink overflow the glass?
When you pour an aerated (fizzy) drink such as lemonade or beer into a glass, the froth rises above the liquid level, but usually stops rising when it reaches the rim of the glass, even though you ...
- 294
0
votes
1
answer
79
views
Why does the force on bubble on a flow differ from that of a sphere in a flow?
Background:
A tiny sphere of radius $a$ in a slow moving laminar fluid flow with viscosity $\mu$ is acted on by a force given by the well known Stokes equation:
$$F_s = 6 \pi \mu a U,$$
where $U$ is ...
- 205
0
votes
1
answer
109
views
Which forces keep two soap bubbles together?
I am trying to calculate how many soap bubbles can hang together against the force of gravity, but I am not sure what forces hold them together. My guess is the surface tension, so an equation like $F=...
0
votes
2
answers
121
views
Hydrogen in soap bubble
I read somewhere that if hydrogen gas is passed through soap solution bubbles containing hydrogen are formed. My question is how these bubbles are stable! Hydrogen has much less density and mass than ...
- 1
0
votes
1
answer
136
views
Why bubbles are not moving up in a kettle full of water?
When I boil water in the kettle, many tiny bobbles appear after a short time, long before boiling (See video here). They don't seem to come from the bottom of the kettle, like in boiling, but from ...
- 2,157
1
vote
1
answer
58
views
Does bubble in the buble chamber represented the actural measurement of the particle or the trajectory of the potential?
The bauble chamber was used as a measurement in the particle physics. Traditionally, the thoughts were that when the particle made an excitation in the chamber, as to physically measured, a bubble was ...
- 3,306
0
votes
1
answer
772
views
How do you mathematically describe the quantum bubble?
The vacuum is filled with quantum bubbles. In a Feynman diagram this would correspond to a closed one particle propagator line, a circle, or a bubble. I'm curious how this is described mathematically. ...
0
votes
1
answer
216
views
Dimensional analysis of soap bubble formation
I was wondering how the radius of a soap bubble depends on the way it is formed and tried to come up with a simple argument using dimensional analysis. I am not sure if that argument if correct, or ...
- 530
1
vote
0
answers
92
views
Two questions about Sonoluminescence in water: Does it produce Cherenkov radiation? Could be done with a laser beam instead of sound?
Two questions about Sonoluminescence in water:
Does Sonoluminescence in water produce Cherenkov radiation when the bubble is collapsing?
Could be made the same collapsing bubbles but instead of using ...
- 103
4
votes
0
answers
552
views
If vacuum decay was somehow triggered inside a black hole, would the rest of the universe notice?
If vacuum decay is triggered, it will spread (at maximum) at the speed of light. But the spacetime inside a black hole is causally disconnected from the space outside. Nothing that happens inside the ...
- 1,435
2
votes
2
answers
198
views
Since the pressure in smaller bubble decreases why does its radius decreases and not increase, as it should, in the "communicating bubble" experiment?
If we blow two soap bubbles from two communicating pipes with funnels at the ends (see the fig) and close the tube to which they are connected, air will flow from the smaller bubble to the larger ...
- 500
4
votes
4
answers
469
views
Why do the bubbles in a champagne accelerate?
The bubbles in champagne are familiar to most people. They form almost exclusively at the specific points in the champagne glass, and from these they rise faster and faster. Why do the bubbles in ...
0
votes
1
answer
67
views
Theoretical reason behind surface formed when blowing bubbles
For a surface with boundary as a curve in $\mathbb{R^2}$ , the surface formed when blowing bubbles may looked like a sphere with a disc of area removed.
I know that the surface tension forces on the ...
- 8,040
2
votes
0
answers
45
views
From where do the bubbles come from in an aerated tap? [duplicate]
It is common knowledge that when the opening of a tap has many holes, the water flows out as a stream of bubbles.
But if you open the tap slowly, the water flow is laminar without any bubbles at first....
- 12.6k
2
votes
1
answer
235
views
Excess pressure of soap bubble in different medium
I have been wondering that why excess pressure of soap bubble remains
$${4S}/{R}$$
Even if it is in water or in air?
- 727
0
votes
1
answer
102
views
Can a bubble of vacuum move through space?
If there are really regions in space where a vacuum exists, I have learned there can still exist electric and magnetic fields within. That makes this region then differentiable from the regions around ...
- 103
0
votes
2
answers
56
views
Non-popping bubbles
I used a compressed air can to clean my laptop's keyboard and speakers. After that procedure I noticed there're small bubbles in the holes of the speakers. I've tried to pop them with a thin brush and ...
- 101
2
votes
1
answer
362
views
What caused the air bubbles on the bottle wall to move downwards?
Recently, I found an interesting phenomenon. I observe that there are some air bubbles formed on my bottle wall, as shown in the image.
Then, I tilt the water bottle gently such that the water level ...
- 138
1
vote
1
answer
231
views
What is this equation of volumes and pressures of the soap bubble?
Initially the uncharged soap bubble exists with the radius $r$ and the surface tension $T$
Nextly the bubble has been held the potential $V$at the surface of it and the radius of the bubble became $R~~...
0
votes
0
answers
32
views
Could gravitational waves have their origin in collision of true and false vacuum?
Could the gravitational waves the consequence of the collision between a true vacuum bubble and a false vacuum bubble, at the beginning of the universe?
(as they try to explain there:
https://www....
0
votes
2
answers
953
views
What is a bubble from nothing?
Recently I was reading a collection of lectures on Swampland Conjecture and came across an interesting subtitle about a bubble from nothing.
A bubble from nothing is a non-perturbative instability ...
- 956
23
votes
5
answers
6k
views
How does rubbing soap on wet skin produce foam, and does it really enhance cleaning?
We tend to rub soap after applying it to the skin. I found it interesting that the mere act of sliding our hands on the wet skin surface produces millions of air bubbles in the liquid, that later ...
- 12.6k