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Question

According to Blasius solution the local skin friction coefficient in the boundary layer over a flat plate is given by

The correct answer is

\(\frac{{0.664}}{{R{e^{1/2}}}}\)

The laminar, zero-pressure-gradient Blasius solution gives the local coefficient \(C_{f,x}=0.664/\sqrt{Re_x}\). The coefficient 1.328 applies to the average over the plate.

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Important Questions from Boundary Layer Theory

  1. Friction drag is generally larger than the pressure drag in _______.

  2. When a fluid flows along a solid boundary, more and more fluid gets retarded in the vicinity of the boundary. This deceleration is accompanied by:

  3. A plate of 500 mm × 200 mm has been placed longitudinally in a stream of an oil which flows with a velocity of 1.0 m/s. The kinematic viscosity of the oil was 0.5 stoke. The thickness of the boundary layer at the trailing edge is _______.

  4. As defined by Prandtl, in convective heat transfer, a thin layer next to the wall where shear stress is confined is called _____.

  5. Thickness of laminar boundary layer on flat plate:

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