Static or dynamic pressures in duct

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To maximize airflow through a duct, a higher dynamic pressure is preferred, as it increases the velocity of the flow while maintaining total pressure. A high dynamic pressure results in lower static pressure, which effectively "sucks" air through the duct. The discussion highlights the complexity of airflow dynamics, particularly when the duct is not aligned with the airflow direction. Clarification on the original question is needed for better understanding, as the topic can be challenging without visual aids. Ultimately, increasing dynamic pressure is key to optimizing airflow in duct systems.
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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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