Is Fanno flow compressible?

Fanno flow is the adiabatic flow through a constant area duct where the effect of friction is considered. Compressibility effects often come into consideration, although the Fanno flow model certainly also applies to incompressible flow. The viscous friction causes the flow properties to change along the duct.

What is Fanno flow equation?

1. FANNO CURVE & FANNO EQUATION Dhaval Chauhan Mechanical Engineer. Fanno Curve  Consider a flow of a fluid in a perfectly insulated (Q=0) constant area duct.  Continuity equation: ṁ = ρ ∙ AC ∴ ṁ A = ρ ∙ C = Constant, G …( 1) Where G = Mass flow density.

What is critical length in Fanno flow?

The critical length of the pipe is the length required for the flow to choke at the exit (i.e. M = 1 at exit). With an inlet Mach no of 0.5 and a friction factor of 0.002, and pipe diameter of 6 inches the critical length is calculated to be 3207 inches. This length is kept fixed for the cases of constant area pipes.

Which is Fanno flow model applies to incompressible flow?

Compressibility effects often come into consideration, although the Fanno flow model certainly also applies to incompressible flow. For this model, the duct area remains constant, the flow is assumed to be steady and one-dimensional, and no mass is added within the duct.

When does the Fanno line reach its maximum entropy?

The equation above can be used to plot the Fanno line, which represents a locus of states for given Fanno flow conditions on an H – ΔS diagram. In the diagram, the Fanno line reaches maximum entropy at H = 0.833 and the flow is choked. According to the Second law of thermodynamics, entropy must always increase for Fanno flow.

Who is the author of the Fanno flow table?

Dr. Genick Bar-Meir. Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.2 or later or Potto license.

Is the stagnation temperature of Fanno flow constant?

As was stated earlier, the area and mass flow rate in the duct are held constant for Fanno flow. Additionally, the stagnation temperature remains constant. These relations are shown below with the * symbol representing the throat location where choking can occur.