Air flows into and out of a room, as shown, with the pressure and temperature at 100 kPa and 18ºC at all positions. If the volume flow rate V3 = 20 m3/min, the mass flux m1 = 0.2 kg/s, the the velocity V2 is nearest:
A) 8.1 m/s
B) 5.8 m/s
C) 3.4 m/s
D) 2.5 m/s
C) 3.4 m/s
Flows are assumed to be steady flows unless otherwise stated (very few flows are unsteady flows in an introductory thermodynamics course). The conservation of mass takes the form
Be careful with the units. Use m and s with kPa and temperature in K. Never use time in minutes or distance in cm. If you use the proper units, you won’t have to check the units in every problem.
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