Consider the wind tunnel and flow conditions described in Probs. 4.49–4.52. Calculate the rate of change of velocity with respect to distance at {a) the diffuser inlet, and (b) the diffuser exit Probs. 4.49 Consider a low-speed wind tunnel (see Fig. 4.15) that is a constant width of2 m throughout its length (i.e., each cross section of the tunnel is a rectangle of width 2m). The entrance and exit heights of the nozzle are 4 m and 0.5 m, respectively. The airflow velocity in the test section is 120 mph. Calculate the airflow velocity in m/sec at the entrance to the nozzle. PROB. 4.52. Consider the flow through the wind tunnel in Prob. 4.49. The entrance and exit heights of the diffuser are 0.5 m and 3.5 m, respectively. What are the flow velocities at the entrance and exit of the diffuse.
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