Question

Fanno flow is characterized by

• A. Heat transfer without friction
• B. Friction without heat transfer
• C. Isentropic flow
• D. Shockless flow

Hint:

Compressible flow models: \[ \boxed{ \begin{aligned} \text{Fanno Flow} &\rightarrow \text{Friction, No Heat Transfer} \text{Rayleigh Flow} &\rightarrow \text{Heat Transfer, No Friction} \text{Isentropic Flow} &\rightarrow \text{No Friction, No Heat Transfer} \end{aligned} } \]

Answer 1

The Correct Option is B

Step 1: Recall the definition of Fanno flow. Fanno flow is the flow through a constant-area duct in which \[ \boxed{\text{friction is present but there is no heat transfer}.} \] Thus, the flow is adiabatic but irreversible due to wall friction.

Step 2: Identify the correct characteristic. Therefore, \[ \boxed{\text{Friction without heat transfer}} \] is the defining characteristic of Fanno flow. Hence, \[ \boxed{(B)} \] is the correct answer.