Static or dynamic pressures in duct

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Discussion Overview

The discussion centers on the relationship between static and dynamic pressures in a duct, particularly in the context of airflow around an object in a wind tunnel. Participants explore how these pressures affect airflow maximization, considering both theoretical and practical implications.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant suggests that maximizing airflow through the duct would require a high dynamic pressure, as this would create a low static pressure that "sucks" air through the duct.
  • Another participant points out that for incompressible airflow, increasing dynamic pressure corresponds to raising the velocity of the flow, which may relate to maximizing airflow, though the connection to the original question is unclear.
  • Several participants express confusion about the initial question and request clarification or assistance from others.

Areas of Agreement / Disagreement

The discussion remains unresolved, with multiple competing views on how dynamic and static pressures interact to affect airflow. Some participants agree on the importance of dynamic pressure, while others seek clarification on the initial premise.

Contextual Notes

Participants note the difficulty in understanding the question without additional visual aids or clearer descriptions, indicating potential limitations in the communication of the problem.

Jonny6001
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Hello, I have a little question regarding airflow.

You have an object in a wind-tunnel, which has a dynamic pressure of 1000Pa and say static pressure of 99000Pa.

If the object has a duct with static and total pressure probes, to maximise airflow through that duct, would you be looking for the highest or lowest dynamic pressure?

The way I approach it is, if the dynamic pressure is high the it will cause low static pressure which has the effect of trying to "suck" air though the duct. So a high dynamic pressure in the duct will maximize airflow. Do you guys agree with this?

Just as an aside, the duct is not exactly in-line with the air flow direction.
 
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anorlunda said:
ping @Chestermiller . Help needed, spring cleaning.
Sorry. I really don't understand what this member is asking. Maybe @boneh3ad can help.
 
1) This is from February 2010, so... um...

2) This is incredibly hard to parse without some kind of drawing or at least a better written description.

3) The short answer is that for any duct, for a given total pressure, incompressible air flow will be maximized when you raise the dynamic pressure because, literally, that amounts to raising the velocity of the flow. I have no idea how this relates to the broader question.
 
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