Air enters an elbow with a uniform speed of \(10 \mathrm{~m} / \mathrm{s}\) as shown in Fig. P4.62. 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 \(A B C D\) coincides with the system at time \(t=0\). Make a sketch to indicate

(a) the system at time \(t=0.01 \mathrm{~s}\) and

(b) the fluid that has entered and exited the control volume in that time period.

Figure P4.62

Transcribed Image Text:

D V = 10 m/s A 1 m 5 m/s -1 m- Control volume Reverse flow B C 15 m/s