Discuss which pressure gauge in the diagram shows a higher pressure
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During the process of supplying air from the air source to the air tank, the pressure at three different points is measured – which one will be higher?
The pressure gauge in front is higher, that is, pressure gauge 1.
What if we consider the effect of flow velocity? The gas flow rate in the gas cylinder is low, almost stationary
1. Under normal operating conditions, when the gas flow rate in the tank is low, the pressures of the three components should be equal； 2. If the gas cylinder is empty and air is just being introduced into it, the pressure indicated by gauge 3 will be high ； 3. If high-speed flow is maintained and the air intake and exhaust are in balance, gauge 1 should be slightly higher.
The pressure gauge 3 shows the highest value; there is flow rate for those ahead
Check how long the pipeline is; if it’s not very long, then 3 should be a better choice, as both 1 and 2 have velocity heads. However, if the pipeline is very long or very thin, then the pressure drop in the pipeline will be greater than the loss due to velocity head; in that case, pressure 1 will be the highest.
There are many experts out there. The pressure gauge 2 is connected to a closed end of a tee where no gas flow occurs; could the fast flow of gas in the main pipeline cause a vacuum effect on it, leading to a drop in pressure?