Working out as follows
x= (20-6)/20 = 0.7
Fk = k / air specific heat ratio
Fk = 1.31/1.4
Fk = 0.94
xT = Fk * x
0.94 x 0.7 = 0.658
because xT < x = 0.658<0.7 flow through the valve is choked
Expansion factor Y
Y = 1 - x/( 3 x Fk x xT )
Y= 1- 0.7/( 3 x 0.94 x 0.658)
Y = 0.623...
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The Attempt at a Solution
The Attempt at a Solution
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