Air Pressure vs Liquid Pressure

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SUMMARY

The discussion centers on the pressure dynamics within a closed steel pipe fitting containing liquid algae heated to 570 degrees Fahrenheit. The user references Gay-Lussac's Law, which pertains to gas pressure, and seeks to understand the pressure exerted by a thick liquid medium. The experiment described involves heating 1.5 milliliters of wet algae in a steel connector plunged into 1,100-degree Fahrenheit sand, achieving optimal results within a heating duration of 10 to 40 minutes. The user aims to determine the necessary material for constructing a pressure vessel suitable for this application.

PREREQUISITES
  • Understanding of Gay-Lussac's Law and its application to gases
  • Knowledge of liquid pressure dynamics in closed systems
  • Familiarity with superheating concepts
  • Basic principles of material science for pressure vessel construction
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  • Research the principles of liquid pressure in closed containers
  • Learn about superheating water and its implications for pressure
  • Investigate materials suitable for high-pressure vessels
  • Explore experimental methods for measuring pressure in liquid systems
USEFUL FOR

Researchers, engineers, and experimenters involved in high-pressure liquid systems, particularly those working with biofuels and algae processing.

lizardman94
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Okay, so I am looking at this article (link at bottom) and it says they have a microorganism liquid contained inside of a CLOSED steel pipe fitting and they heat it until it's reached about 570 degrees inside.

SO HOW MUCH PRESSURE GROWS INSIDE THE CLOSED CONTAINER?

As far as a real life application, I have used the "gay-lussac's law" but this applies to pressure of GASES, how much pressure is inside of it if it's pretty much all thick liquidy algae goop? I want to know what pressure it gets to so that I can have an idea of what material I need to build a pressure vessel to conduct this type of experiment with.

http://www.motherearthnews.com/gree...to-green-fuel-zb0z1211zmar.aspx#axzz36vOWbnzB
 
Physics news on Phys.org
If the liquid would normally be a gas at that temperature - then you can see that a lot of pressure is needed to keep it in a liquid state.
To make their one-minute biocrude, Savage and Julia Faeth, a doctoral student in Savage’s lab, filled a steel pipe connector with 1.5 milliliters of wet algae, capped it and plunged it into 1,100-degree-Fahrenheit sand. The small volume ensured that the algae was heated through. Previously the team heated the algae from 10 to 90 minutes and saw the best results when treating the algae for 10 to 40 minutes at 570 degrees. A small batch of algae can reach this temperature in one minute.​
Actual paper the article is based on: https://aiche.confex.com/aiche/2012/webprogram/Paper280193.html

So I think you want to look at "superheating water".
 

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