A large tank initially is evacuated to −10 kPa gage. Ambient conditions are 101 kPa at 20°C. At t = 0, an orifice of 5 mm diameter is opened in the tank wall; the vena contracta area is 65 percent of the geometric area. Calculate the mass flow rate at which air initially enters the tank. Show the process on a Ts diagram. Make a schematic plot of mass flow rate as a function of time. Explain why the plot is nonlinear.
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