20 kg/s of air enters a 0.06 m2 duct at a pressure of
320 kPa, and a temperature of 350 K. Find the exit conditions
(pressure, temperature, and Mach number) if heat is added
to the duct at a rate of 650 kJ/kg of air.
Air enters a frictionless, constant-area duct with
p1 5 135 kPa, T1 5 500 K, and V1 5 540 m/s. How much heat
transfer is needed to choke the flow? Is the heat transfer into
or out of the duct?
In the frictionless flow of air through a 100-mmdiameter duct, 1.42 kg/s enters at 52C and 60.0 kPa (abs).
Determine the amount of heat that must be added to choke
the flow, and the fluid properties at the choked state.

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