Bubble in Liquid: Phase Change Under Pressure?

In summary, the pressure inside a bubble equals the pressure outside, but what happens when subjected to high pressure depends on the material and the amount of pressure being applied. In a common situation where air bubbles are introduced into a hydraulic system, the bubbles shrink when pressure is applied. However, there may be a surface tension term that tries to collapse the bubble, requiring a pressure difference across the interface to counteract it. The ability of the bubble to shrink and potentially change phase depends on the gas and is summarized in a phase diagram.
  • #1
loncin18
2
0
Anyone ,

what the bubble in the fluid will be if we compressed the fluid with high pressure?
for example the fluid is oil with high viscous.
does the bubble change in phase? (condense)
 
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  • #2
The pressure inside the bubble equals the pressure outside, so what happens depends on how much pressure we're applying and how the material in the bubble behaves when subjected to that pressure.

In the common real life situation in which bubbles of air have been introduced into a hydraulic system, the air compresses and the bubbles shrink when pressure is applied to the system.
 
  • #3
Strictly the bubble pressure will be higher because of a surface tension term in the force balance equation which acts to try to collapse the bubble. To counter this, there must be a pressure difference across the interface
 
  • #4
All,

Thanks for your Answer, i also perceived this case in hydraulic term, whatever the pressure inside the bubble but what i exactly want to know is the ability of the bubble to shrink, how far it can go for shrink, let say that i can produce a very high pressure to compress the liquid and the equipment has very high rating of pressure.
does the bubble remain there?or it change its phase ,or shrink to some particular size and cannot be compressed anymore ( like solid )...
sorry for my poor English..
 
  • #5
The molecules cannot dissappear but they can change phase under sufficient pressure. THe exact conditions required to cause a phase change will depend on the gas and are summarised in a phase diagram.
 

1. What causes bubbles to form in liquids?

Bubbles in liquids are caused by a phase change under pressure. When the pressure of a liquid is reduced, the gas molecules dissolved in the liquid are able to escape and form bubbles. This process is known as "boiling" and is commonly seen when heating water.

2. How does pressure affect the formation of bubbles in liquids?

As mentioned before, bubbles form in liquids when the pressure is reduced. This means that the lower the pressure, the easier it is for gas molecules to escape from the liquid and form bubbles. On the other hand, increasing the pressure of a liquid makes it more difficult for bubbles to form.

3. Why do bubbles in liquids sometimes disappear?

Bubbles in liquids can disappear due to a process called "cavitation". This occurs when the pressure around a bubble increases and causes it to implode, or collapse. This can happen when a liquid is agitated or when it flows through a narrow space, such as in a pump or a pipe.

4. Can bubbles in liquids be harmful?

In most cases, bubbles in liquids are harmless. However, in certain situations, they can be dangerous. For example, in medical procedures or industrial processes, air bubbles can disrupt the flow of liquids and cause blockages. In the human body, air bubbles can also cause serious health issues, such as embolisms.

5. How do scientists study bubbles in liquids?

Scientists use a variety of techniques to study bubbles in liquids, such as high-speed cameras, ultrasound imaging, and computer simulations. They also conduct experiments to measure the size, shape, and movement of bubbles, as well as their impact on the surrounding liquid. This research is important for understanding the behavior of liquids and can have practical applications in areas such as medicine, engineering, and materials science.

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