Air enters an elbow with a uniform speed of 10 m/s as shown in Fig. P4.35. At the exit o...

Air enters an elbow with a uniform speed of 10 m/s as shown in Fig. P4.35. At the exit of the elbow the velocity profile is not uniform. In fact, there is a region of separation or reverse flow. The fixed control volume ABCD coincides with the system at time t = 0. Make a sketch to indicate (a) the system at time t = 0.01 s and (b) the fluid that has entered and exited the control volume in that time period.