- #1
tomliu93
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For Fanno flow, there is no change in h0 since no heat transfer and shaft work. I am wondering whether friction does work or not. Could anyone help me out? Thanks.
Does friction play a role in Fanno flow?
- Thread starter tomliu93
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In summary, Fanno Flow is a type of compressible flow described by Italian physicist Gino Fanno in 1932, where fluid flows through a constant area duct with friction. The main assumptions include compressibility, steady and one-dimensional flow, and no heat transfer. It differs from Rayleigh Flow in the assumptions made about the flow. The Fanno Flow parameter, also known as the Mach number parameter, is a dimensionless quantity used to determine the flow behavior and critical conditions. Fanno Flow is used in the design and analysis of supersonic aircraft engines, gas pipelines, and rocket nozzles, as well as in the study of shock waves and their effects on aerodynamics and heat transfer.
- #2
Sunfire
- 221
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Friction will result in slowing down the fluid at the wall, thus converting kinetic energy into internal. So the dynamic temperature v^2/2cp will drop, but the static temperature will rise. The total temperature and the total enthalpy remain the same.
Hope this helps!
Hope this helps!
- #3
Sunfire
- 221
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In this way you see that h0 remains the same, no work is spent or added. The friction force does not do work.
1. What is Fanno Flow?
Fanno Flow is a type of compressible flow where the fluid flows through a constant area duct with friction. It is named after the Italian physicist Gino Fanno, who first described this type of flow in 1932.
2. What are the assumptions made in Fanno Flow?
The main assumptions made in Fanno Flow include: the fluid is compressible, the flow is steady and one-dimensional, the duct has a constant cross-sectional area, and there is no heat transfer to or from the fluid.
3. How is Fanno Flow different from Rayleigh Flow?
While both Fanno Flow and Rayleigh Flow are types of compressible flow, they differ in the assumptions made about the flow. Fanno Flow assumes a constant area duct with friction, while Rayleigh Flow assumes a variable area duct with no friction.
4. What is the significance of the Fanno Flow parameter?
The Fanno Flow parameter, also known as the Mach number parameter, is a dimensionless quantity that relates the fluid velocity to the speed of sound in the fluid. It is used to determine the behavior of the flow and the critical conditions at which the flow becomes choked.
5. How is Fanno Flow used in real-world applications?
Fanno Flow is commonly used in the design and analysis of supersonic aircraft engines, gas pipelines, and rocket nozzles. It is also relevant in the study of shock waves and their effects on aerodynamics and heat transfer in high-speed flows.
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