Air flow enters a constant-area insulated duct with a Mach number = 0.2. The duc

Question

Air flow enters a constant-area insulated duct with a Mach number = 0.2. The duct diameter is 10 mm and the friction factor is 0.02 . (A) Deternine the duct length required to reach Mach 0.6 (B) Determine the length required to attain Mach 1.0 (C) Now suppose that an additional 750 mm of duct length is added. If the same initial stagnation conditions are maintained, determine the reduction in flow rate that will occur. (D) Now suppose that the duct (the duct whose length gave Ma = 1 at the outlet) is extended by 92.2%. If the same initial inlet stagnation conditions are maintained, determine the reduction in flow rate that will occur.

Explanation / Answer

mach no=0.2 d=10mm f=0.02 a)we know that fL/D=0.451 =>L=0.451(0.01)/0.6=7.51mm b)fL/D=1 =>L=0.5m

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