Consider the velocity boundary layer profile for flow over a flat plate to be of the form u = C 1 + C 2 y . Applying appropriate boundary conditions, obtain an expression for the velocity profile in terms of the boundary layer thickness δ and the free stream velocity u ∞ . Using the integral form of the boundary layer momentum equation (Appendix G), obtain expressions for the boundary layer thickness and the local friction coefficient, expressing your result in terms of the local Reynolds number. Compare your results with those obtained from the exact solution (Section 7.2.1) and the integral solution with a cubic profile (Appendix G).
Consider the velocity boundary layer profile for flow over a flat plate to be of the form u = C 1 + C 2 y . Applying appropriate boundary conditions, obtain an expression for the velocity profile in terms of the boundary layer thickness δ and the free stream velocity u ∞ . Using the integral form of the boundary layer momentum equation (Appendix G), obtain expressions for the boundary layer thickness and the local friction coefficient, expressing your result in terms of the local Reynolds number. Compare your results with those obtained from the exact solution (Section 7.2.1) and the integral solution with a cubic profile (Appendix G).
Solution Summary: The author explains the expression for the boundary layer thickness and the local friction coefficient.
Consider the velocity boundary layer profile for flow over a flat plate to be of the form
u
=
C
1
+
C
2
y
.
Applying appropriate boundary conditions, obtain an expression for the velocity profile in terms of the boundary layer thickness
δ
and the free stream velocity
u
∞
.
Using the integral form of the boundary layer momentum equation (Appendix G), obtain expressions for the boundary layer thickness and the local friction coefficient, expressing your result in terms of the local Reynolds number. Compare your results with those obtained from the exact solution (Section 7.2.1) and the integral solution with a cubic profile (Appendix G).
Write in the boxes on the side that the following statements given about the laminar boundary layer on a flat plate are true or false.
a) when the density of the fluid increases, the boundary layer thickness increases.b) when the viscosity of the fluid increases, the boundary layer thickness increases.c) if the Reynolds number is increased at an X-position, the boundary layer thickness increases.d) if the external flow rate increases, the boundary layer thickness increases.e) turbulent ST has a fuller speed profile than laminar ST.
For the steady flat plate boundary layer flow, determine the wall shear stress assuming the following velocity profile. Where, δ is the boundary layer thickness and U is the outer flow velocity (constant).
The viscous laminar flow of air over a flat plate results in the formation of a boundary layer. The
boundary layer thickness at the end of the plate of length L is
Delta L .
When the plate length is
increased to twice its original length. The percentage change in laminar boundary layer thickness
at the end of the plate (with respect to
Delta L
) is ______
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