For Problem 19, for how long will the flow remain choked at the throat after the valve is opened?
Problem 19
A tank of volume 100 ft3 is evacuated to a pressure of 0.001 atm and allowed to settle to room temperature. It is connected to the outside environment at 1 atm and 65°F through a converging–diverging nozzle with throat diameter of 1 in, and outer bell mouth diameter of 5 in. If a valve is suddenly opened to allow the outside air to enter the evacuated tank, what will be the Mach number of the incoming air flow at the throat?
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