How Does Pressure Affect Dissolved Oxygen in Water Systems?

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Discussion Overview

The discussion revolves around the relationship between pressure and the solubility of oxygen in water systems, specifically how to estimate the pressure drop when air is dissolved in water under pressure. Participants are exploring the application of Henry's law to calculate this pressure drop.

Discussion Character

  • Exploratory
  • Technical explanation
  • Mathematical reasoning

Main Points Raised

  • One participant seeks to estimate the pressure drop in a plumbing system when air is dissolved in water, asking for guidance on reaching equilibrium pressure.
  • Another participant suggests consulting Henry's law as a potential solution to the problem.
  • A participant expresses difficulty in applying Henry's law to calculate the pressure drop, indicating a need for further assistance.
  • One participant claims to have calculated the difference in air concentration after applying pressure and questions whether they can derive a formula for pressure based on this information.
  • A later reply offers to work through an example if specific values for water and air volumes, as well as the desired pressure, are provided.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus on how to apply Henry's law for calculating pressure drop, and multiple viewpoints on the approach remain present.

Contextual Notes

The discussion includes assumptions about the system's conditions and the applicability of Henry's law, but these assumptions are not fully explored or resolved.

Who May Find This Useful

This discussion may be useful for individuals interested in fluid dynamics, environmental science, or anyone working with gas solubility in liquids under varying pressure conditions.

fhon
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Hello Everyone,

I've been trying to find an answer to this but am not getting anywhere. Any help would be greatly appreciated!

I need to be able to calculate (or more likely estimate) the pressure drop I can expect when putting water under pressure if I know there is air in the system.

For example if I have a plumbing system that I pressurize to 100 PSI then removed the pressure source. I know how much water is in the system and can estimate how much air is trapped in sections where I can not purge it. I know the pressure will drop as air is dissolved into the water but at what PSI will it reach equilibrium and no longer dissolve air into the water?

Can anyone help point me in the right direction?
 
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Google Henry’s law.
 
Thank you. Henry's law looks like what I need, but I cannot for the life of me figure out how to use it to calculate the pressure drop I will have. Sorry to be so needy but any help would really be appreciated
 
How about this? I've been able to calculate the difference in concentration of air in the solution after applying the 100 PSI to it using Henry's law. Now if I know the previous and current concentration and the volume of water and air I must be able to use some formula for the pressure. Am I on the right track here?
 
fhon said:
How about this? I've been able to calculate the difference in concentration of air in the solution after applying the 100 PSI to it using Henry's law. Now if I know the previous and current concentration and the volume of water and air I must be able to use some formula for the pressure. Am I on the right track here?
Why don't you specify a problem, and I'll work an example for you? Specify the total amount of water and the total amount of air, and the pressure you want to consider.
 

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