1. Liquid water flows isothermally at 208C through a one- inlet, one-exit duct operating at steady state. The duct's inlet
m· 1 = 0.8 lb/s
mi = 3000 lb
m· 2 = 1.3 lb/s
m· 3 = 2.6 lb/s
and exit diameters are 0.02 m and 0.04 m, respectively. At the inlet, the velocity is 40 m/s and pressure is 1 bar. At the exit, determine the mass flow rate, in kg/s, and velocity, in m/s.
2. Air enters a one-inlet, one-exit control volume at 6 bar, 500 K, and 30 m/s through a flow area of 28 cm2. At the exit, the pressure is 3 bar, the temperature is 456.5 K, and the velocity is 300 m/s. The air behaves as an ideal gas. For steady-state operation, determine
(a) the mass flow rate, in kg/s.
(b) the exit flow area, in cm2.