Air ows steadily in a thermally insulated pipe with a constant diameter of 6.35 cm, and an average friction factor of 0.005. At the pipe entrance, the air has a Mach number of 0.12, stagnation pressure 280 kPa, and stagnation temperature 825 K. Determine: a. The length of pipe required to reach the sonic state
b. The static pressure and temperature at the exit if the pipe is 25 m long

Solution:

Given :

D = 6.35 cm

a). From fanno flow table (γ = 1.4)

At ,    

At ,      

∴  

L = 144.17 m

b). If L = 25 m

From fanno flow , (γ = 1.4)

answer:

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