As will be discussed in Chaps 7 and 8, the flow of a stream Uo past a blunt flat plate creates a broad low-velocity wake behind the plate. A simple model is given in Fig. P3.25, with only half of the flow shown due to symmetry, The velocity profile behind the plate is idealized as €œdead air€ (near-zero velocity) behind the plate, plus a higher velocity, decaying vertically above the wake according to the variation u ≈ Uo + ΔUe−z/L, where L is the plate height and z = 0 is the top of the wake. Find ΔU as a function of stream speed Uo

Uo Exponential curve Width b into paper Dead air (negligible velocity) Fig. P3.25