Answer to Question #175244 in Mechanical Engineering for Von Nikko

Question #175244

An adiabatic expansion of air occurs through a nozzle (W1=0) from 850 kPa and 75C to 140 kPa. For an isentropic expansion find: specific volume(m/kg), temperature(C) and velocity(m/s) at the exit section assuming initial kinetic energy is negligible


1
Expert's answer
2021-04-01T01:10:21-0400

The inlet temperature(T1)= 75 C=75+273=348 K

Inlet Pressure(P1)=850 x 103 Pa

The exit Pressure(P2)=140x103Pa

Assuming air as ideal gas having following properties:

Cp = 1.004 kJ/kg.K, Cv = 0.718 kJ/kg.​K, k = 1.4 and R=0.287 kJ/kg K


Since the expansion is adiabatic,


specific volume at exit is given by,


In an adiabatic turbine there is no Heat or work transfer between system and surrounding,

W=0, Q=0

Applying steady flow energy equation between inlet and exit.

At inlet velocity of flow is negligible,

=> V1=0

The velocity at exit is given by,


Need a fast expert's response?

Submit order

and get a quick answer at the best price

for any assignment or question with DETAILED EXPLANATIONS!

Comments

No comments. Be the first!

Leave a comment

Ask Your question

LATEST TUTORIALS
New on Blog
APPROVED BY CLIENTS