Bubble in Liquid: Phase Change Under Pressure?

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Discussion Overview

The discussion explores the behavior of bubbles in a viscous liquid under high pressure, specifically focusing on whether the bubbles can change phase or shrink significantly when subjected to compression.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant questions how bubbles in a high-viscosity fluid, like oil, behave under high pressure, particularly whether they condense or change phase.
  • Another participant notes that the pressure inside the bubble equals the external pressure, suggesting that the bubble's behavior depends on the applied pressure and the material's response.
  • A different contribution states that the pressure inside the bubble will be higher due to surface tension, which creates a pressure difference that must be balanced.
  • One participant seeks clarification on the extent to which a bubble can shrink under high pressure, pondering whether it can remain or change phase, or if it reaches a limit similar to a solid state.
  • Another participant mentions that while molecules cannot disappear, they can change phase under sufficient pressure, with the specific conditions varying based on the gas involved and referenced in a phase diagram.

Areas of Agreement / Disagreement

Participants express varying views on the behavior of bubbles under pressure, with no consensus reached on whether bubbles can change phase or the extent of their shrinkage.

Contextual Notes

The discussion includes assumptions about the behavior of materials under pressure and the conditions necessary for phase changes, which are not fully resolved.

loncin18
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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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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.
 
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
 
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..
 
The molecules cannot disappear 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.
 

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