The wind tunnel in Probs. 4.49 and 4.50 has a diffuser that is slightly rounded at the inlet (a sharp corner at the inlet in a subsonic flow will cause undesirable flow separation), and then diverges with straight upper and lower walls, each at 15° relative to the horizontal. Calculate the rate of change of area with respect to distance along the diffuser length (ignore the slightly rounded entrance). Note: This is simply a problem in geometry, not aerodynamics.
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