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  3. 5 a discuss the development and nature of the boundary...

Question: 5 a discuss the development and nature of the boundary...

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5 (a) Discuss the development and nature of the boundary layer over a flat plate in a stream of viscous fluid with uniform velocity (b) The velocity profile in a laminar boundary layer over a flat plate with zero pressure gradient is approximated by, у(2-5) и where is the distance from the wall and n the velocity, non- dimensionalised by the boundary layer thickness, ő and the free-stream velocity respectively Using the momentum integral equation, derive the following expressions for the dependence of the local boundary-layer thickness and local skin friction coefficient, C on the local Reynolds number, Rex- pUx/u based on the distance x from the leading edge. Here ρ is the density, U the free-stream velocity and u the dynamic viscosity of the fluid 8V30 0.73 Consider a bird gliding through quiescent air at 1 m/s. Making reasonable assumptions, use the data in Figure Q5 to estimate the thickness of the boundary layer at the trailing-edge of the wing (c) Mean chord, 0.2 m Figure Q5 Dynamic viscosity of air, μ = 1.8 x 10-5 kg/ms

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