Questions tagged [compressible-flow]
The compressible-flow tag has no usage guidance.
9
questions with no upvoted or accepted answers
2
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0answers
32 views
How to balance flow and pressure in nitrogen purged chambers?
I have an instrument that is technically a humidity controlled chamber. It measures how much moisture is picked up by the sample through a microbalance(Zone 1). Nitrogen gas flows from zone 3 and ...
2
votes
2answers
144 views
Why does exit pressure match back pressure in Converging Diverging Nozzles?
I am trying to understand why normal shocks are caused in Converging Diverging Nozzles. My textbook explains that since the exit pressure must match the back pressure, the normal shock is the only ...
1
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0answers
21 views
Can any Air rotameter be used for refrigerant gas by using equation conversion?
Currently, I am trying to find rotameter calibrated for R134A gas flow. However, most companies only sell rotameter or variable area flowmeter for water/Air/Nitrogen flow. Is it possible to use any ...
1
vote
0answers
64 views
Estimating Static Pressure @ Target Airflow (boost fans)
How do I estimate a pressure/flow curve for a filter of specified area, efficiency rating, MERV and MPR?(Duct work is negligible)
I am trying to pick an appropriately rated fan/fans to maintain a ...
1
vote
0answers
55 views
Water Valve Functionality
Before to present my question, I have to say that I'm not a hydraulic expert.
I'm working on a water valve design and I found this model which work with a diaphragm and a spring. I want to consider ...
0
votes
0answers
23 views
Joule Thompson Effect and Isenthalpic Processes
We are trying to compute the Joule Thompson (JT) coefficient for air going through a valve from P1 to P2 (where P2 is a much lower pressure). Beginning this we were thinking that the water in the air ...
0
votes
0answers
14 views
How to calculate mass flowrate of gas from vacuum pump curve?
Let's assume we have a liquid ring vacuum pump. The pump curve for this pump is plotted as "suction capacity" in m3/hr vs suction pressure in mbar(a).
How does one calculate mass flowrate of ...
0
votes
0answers
22 views
Modeling Friction-reduced Pressure Drop in Natural Gas Flowing along a Horizontal Cylindrical Trunkline (Pipe)
I am seeking some help related to part of a project I am currently working on, where I require to (data-driven) model the pressure drop due to friction for natural gas flowing along a horizontal ...
-1
votes
1answer
45 views
Ideal Exhaust velocity of a rocket nozzle
In a youtube video, they defined exit exhaust velocity of a rocket nozzle as
$$v_2 = \sqrt{\dfrac{2k}{k - 1}RT_1 \left[1 - \left(\dfrac{p_2}{p_1}\right)^{(k - 1) / k}\right]}$$
How can I derive this ...
