An approximation for the boundary-layer shape in is the formula u(y) - U sin 0 sys d where U is the stream velocity far from the wall and d is the boundary layer thickness, as in Fig. If the fluid is helium at 20°C and 1 atm, and if U = 10.8 m/s and 8= 3 cm, use the formula to (a) estimate the wall shear stress Tw in Pa, and (b) find the position in the boundary layer where t is one-half of Tw. -- y = 6 u(y)

Elements Of Electromagnetics
7th Edition
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Author:Sadiku, Matthew N. O.
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An approximation for the boundary-layer shape in
is the formula
u(y) - U sin
0 sys d
where U is the stream velocity far from the wall and d is the
boundary layer thickness, as in Fig.
If the fluid is
helium at 20°C and 1 atm, and if U = 10.8 m/s and 8= 3 cm,
use the formula to (a) estimate the wall shear stress Tw in
Pa, and (b) find the position in the boundary layer where t
is one-half of Tw.
-- y = 6
u(y)
Transcribed Image Text:An approximation for the boundary-layer shape in is the formula u(y) - U sin 0 sys d where U is the stream velocity far from the wall and d is the boundary layer thickness, as in Fig. If the fluid is helium at 20°C and 1 atm, and if U = 10.8 m/s and 8= 3 cm, use the formula to (a) estimate the wall shear stress Tw in Pa, and (b) find the position in the boundary layer where t is one-half of Tw. -- y = 6 u(y)
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