What Happens Thermally When High-Pressure Air Bursts into a Dead-Ended Tube?

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SUMMARY

The discussion focuses on the thermal dynamics when high-pressure air, specifically a real gas at 200 bar, is released into a dead-ended tube. The scenario involves a 1-liter reservoir with a 30 mm diameter rupture disc leading to a 5 mm diameter tubulation, culminating in a 30 mm long dead-ended tube. Key phenomena include expansive cooling from the released air, compressive heating due to high pressure, and potential shock wave effects influenced by friction from two 90-degree turns in the system. The dominant mechanism and effective investigative approaches are also explored.

PREREQUISITES
  • Understanding of thermodynamics, particularly real gas behavior.
  • Familiarity with fluid dynamics, especially in confined spaces.
  • Knowledge of pressure dynamics in gas systems.
  • Experience with experimental design for measuring thermal effects.
NEXT STEPS
  • Research the principles of real gas thermodynamics and their implications in high-pressure scenarios.
  • Study fluid dynamics related to compressible flow in confined geometries.
  • Learn about shock wave phenomena in gas dynamics and their measurement techniques.
  • Investigate experimental setups for measuring temperature changes in rapid gas expansion events.
USEFUL FOR

This discussion is beneficial for engineers, physicists, and researchers involved in fluid dynamics, thermodynamics, and high-pressure gas applications, particularly those analyzing thermal effects in gas release scenarios.

Hiarum
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I have a question in regards to a specific situation and really don't know which elements are significant.

The example is high pressure AIR (a real gas/ not ideal ;-) of relatively unlimited volume,
released via a rupture diaphragm into an enclosed tubulation. (dead ended)

Relative dimensions are 1 liter reservoir at 200 bar, a 30 mm dia. rupture disc into a 5 mm dia. tubulation, a dead ended tube of 30 mm length that has been open to ambient conditions. (no special considerations except it is a trapped volume between the reservoir at the moment of rupture).

The question is what sort of heating/ cooling will be associated with the event?

I can visualize expansive cooling from the released reservoir volume, also, compressive heating from the arriving high pressurization. There may also be "shock wave" phenomena, true? There are two 90 degree "unoptimized" turns after the rupture disc before the tube termination, so friction and churning must be present. (perhaps putting a limit on "shock wave" effects?)

Which mechanism might dominate?
What would be a useful investigative approach to analyze the entire system? Time would seem to limit the measurement possibilities.
 
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I can't visualise the problem from your description .

Please post a clear diagram of the system .
 

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