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February 1, 2006
What is the Hydrodynamic Boundary Layer?
The hydrodynamic Boundary Layer on a flat plate is a thin region adjacent to the
surface (boundary) within which viscous effects are confined.
How is the thickness of the Hydrodynamic Boundary Layer defined?
The thickness of the hydrodynamic boundary layer is the distance from the wall
where the velocity becomes
99% of U
∞
,
where U
∞
is freestream velocity.
u(y)
hydrodynamic
0.99
U
y
∞
=
δ=
What is the Thermal Boundary Layer?
The thermal Boundary Layer on a flat plate is a thin region adjacent to the surface
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 Winter '06
 Ghia

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