One side of the measurement section of a wind tunnel is a glass window,
50 cm long and 25 cm high.
Find the shear force on the window, assuming that Blasius'
solution applies for the boundary layer flow, and that the
effective starting point of the boundary layer is 50 cm
upstream of the upstream edge of the window.
The air in the tunnel is at 15 degrees Centigrade and the velocity
is 10 m/sec. Is Blasius' solution valid?
(The boundary layer turns turbulent at )
Make question 9.3 in the book.
For the flow of question 2,
assuming that the fluid is water and that 1 kg/sec flows through the
channel per unit span,
that the two walls are 2m long and separated
by an 180 degree angle, what is the shear force per unit span on each wall?
Also, what is the pressure force on each wall, and in which direction?
The exit hole is 2 cm long. Ignore gravity.
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