- #1
BradP
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Suppose I have a straight, frictionless duct, with consistent cross-sectional area, and air is flowing straight through and exiting into a free stream. A fan at the beginning of the duct draws stagnant air at atmospheric pressure, and then the air exits the end of the duct into another room also at atmospheric pressure. The air immediately after the fan is at 20 psi, due only to the fan itself.
From that initial pressure, is there any way to determine the velocity when the stream of air is further down the duct and only at 10 psi?
edit: I realize many people will think that I need to know the velocity at the 20 psi point, but notice that I have outlined a determinate system. Given a duct of a certain cross-sectional area, there is only a certain fan power (or speed) that will produce an initial 20 p.s.i. The air stream will have a definite velocity profile.
From that initial pressure, is there any way to determine the velocity when the stream of air is further down the duct and only at 10 psi?
edit: I realize many people will think that I need to know the velocity at the 20 psi point, but notice that I have outlined a determinate system. Given a duct of a certain cross-sectional area, there is only a certain fan power (or speed) that will produce an initial 20 p.s.i. The air stream will have a definite velocity profile.
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