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Helium gas flows adiabatically in a 2-in sch. 40 steel pipe with f = 0.002. The gas enters at Ma = 2.5 and exits at

Helium gas flows adiabatically in a 2-in sch. 40 steel pipe with f = 0.002. The gas enters at Ma = 2.5 and exits at Ma = 1.5. Determine the length of pipe required. What would be the critical length of the pipe?

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