Question

2. a. Establish the concept of velocity boundary layer for a fluid flow over a flat plate with the aid of a sketch. [3 marks] b. Explain the displacement thickness in a wind tunnel flow and suggest the possible solution to provide a uniform velocity in the wind tunnel. [5 marks] c. Air flows, with a velocity of 12 m/s, over 4-m-long flat plate. The properties of air are: $\rho_{\infty}$ =1.204 kg/m$^3$ and $\mu$ = 1.825x10$^{-5}$ kg/m.s. i. Determine the thickness of the boundary layer and the local shear stress at a distance of 1.2 m from the leading edge of the plate. [7 marks] ii. Determine the air drag force per unit width of the plate with a drag coefficient equals 2.4. [4 marks] d. If the velocity of the air flow over a flat plate is doubled, prove that the thickness of the velocity boundary layer at a certain point in the laminar section is decreased. [6 marks]

          2.
a. Establish the concept of velocity boundary layer for a fluid flow over
a flat plate with the aid of a sketch.
[3 marks]
b. Explain the displacement thickness in a wind tunnel flow and
suggest the possible solution to provide a uniform velocity in the
wind tunnel.
[5 marks]
c. Air flows, with a velocity of 12 m/s, over 4-m-long flat plate. The
properties of air are: $\rho_{\infty}$ =1.204 kg/m$^3$ and $\mu$ = 1.825x10$^{-5}$ kg/m.s.
i. Determine the thickness of the boundary layer and the local
shear stress at a distance of 1.2 m from the leading edge of
the plate.
[7 marks]
ii. Determine the air drag force per unit width of the plate with a
drag coefficient equals 2.4.
[4 marks]
d. If the velocity of the air flow over a flat plate is doubled, prove that
the thickness of the velocity boundary layer at a certain point in the
laminar section is decreased.
[6 marks]

2.
a. Establish the concept of velocity boundary layer for a fluid flow over
a flat plate with the aid of a sketch.
[3 marks]
b. Explain the displacement thickness in a wind tunnel flow and
suggest the possible solution to provide a uniform velocity in the
wind tunnel.
[5 marks]
c. Air flows, with a velocity of 12 m/s, over 4-m-long flat plate. The
properties of air are: ρ∞ =1.204 kg/m^3 and μ = 1.825x10^-5 kg/m.s.
i. Determine the thickness of the boundary layer and the local
shear stress at a distance of 1.2 m from the leading edge of
the plate.
[7 marks]
ii. Determine the air drag force per unit width of the plate with a
drag coefficient equals 2.4.
[4 marks]
d. If the velocity of the air flow over a flat plate is doubled, prove that
the thickness of the velocity boundary layer at a certain point in the
laminar section is decreased.
[6 marks]

Added by Pablo R.

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