Pressure Tap Location: Reasoning Needed

  • Thread starter sycorax
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In summary, the speaker needs to measure the pressure drop across a core or restriction in a 4"ID tube with air flowing at a rate of 15 g/sec. The core is 10" long and 3.92" wide, and the speaker is unsure where to place the pressure taps. They ask for a logical reason behind selecting the placement and inquire if the core is porous. They also clarify their goal of finding the pressure drop caused by the core/restriction. The speaker notes that the placement of the pressure taps depends on what they are trying to find, and typically they do not want to place taps in disturbed flow unless that is the desired outcome.
  • #1
sycorax
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I need to measure the pressure drop across a core( let's say a restriction). Air is flowing ( around 15 g/sec) in a 4"ID tube which is very long( irrelevant). Now there is a core ( or let's call it some restriction) in the pipe which is 10" long and around 3.92" wide which fills in the 4" tube. Now where do I place the pressure taps? Do i place right near the core/restriction around 1" in front of it and 1" behind it or do i place quite some distance from it , like 10" in front of it and 10" behind it.

Any logical reason behind selecting where to put the pressure taps.

Appreciate your replies. Thanks.
 
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  • #2
Is this core/restriction porous?

Also, what is your goal? To find the pressure drop caused by the core/restriction?
 
  • #3
It's hard to imagine what the hell is going on. Like Matt said, where you put them depends on what you're trying to find. Are you after the pressure difference just around the restriction or at the front and end of the pipe? You usually don't want to place taps in the disturbed flow, but this might be what you'r after. We don't know.
 

1. What is the purpose of pressure tap location in scientific experiments?

The purpose of pressure tap location in scientific experiments is to determine the pressure of a fluid at a specific point in a system. This information is crucial in understanding the flow of fluids and how they interact with different components in a system.

2. How do scientists determine the best pressure tap location?

Scientists determine the best pressure tap location by considering the flow characteristics of the fluid in the system, the desired accuracy of the pressure measurement, and the potential impact of the pressure tap on the system. They may also use computational fluid dynamics (CFD) simulations to optimize the pressure tap location.

3. What factors can affect the accuracy of pressure measurements at a specific tap location?

The accuracy of pressure measurements at a specific tap location can be affected by factors such as fluid viscosity, flow rate, turbulence, and the presence of obstructions or bends in the system. It is important to carefully consider these factors when selecting a pressure tap location for accurate measurements.

4. Can the pressure tap location be changed during an experiment?

In most cases, it is not recommended to change the pressure tap location during an experiment. This can introduce inconsistency and error in the data. However, if necessary, the pressure tap location can be changed if the same factors that were considered when selecting the initial location are taken into account.

5. How do scientists ensure the reliability of pressure measurements at a specific tap location?

Scientists ensure the reliability of pressure measurements by calibrating the pressure sensor and verifying its accuracy at regular intervals. They also carefully select the pressure tap location and consider all factors that may affect the accuracy of the measurements. Additionally, performing multiple measurements at different times can also help to ensure the reliability of the data.

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