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3.48 The sphere of diameter D of Fig. P3.48 is traveling
with a velocity V of 1.2 m/s in 20°C atmospheric air.
If Re = VD/v is less than 4 × 10“, the boundary
layer around the front of the sphere is completely
laminar. Determine if the boundary layer is com-
pletely laminar on a sphere of diameter:
(a) 1 cm
(b) 1m
Boundary
layer
V
Fig. P3.48

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