The separation of boundary layer can be reduced by
It is recommended that the diffuser angle should be kept less than 18° because
If diffuser angle is more, eddies formation may takes place and also flow separation may occurs.
Boundary layer separation is caused by
Boundary layer separation is caused due to adverse pressure gradient or positive pressure gradient.
Laminar sublayer acts as
In turbulent flow analysis along the boundary layer, a thin layer of fluid in the immediate neighbourhood of the boundary where viscous shear stress is predominant while the shear stress due to turbulence is negligible. This portion is known as laminar sublayer.
In turbulent flow heat transfer is more as compared to laminar flow and also is this laminar sublayer heat transfer is very less while, it is present is turbulent flow hence it acts as insulating medium in turbulent flow.
At the point of boundary layer separation
If u_{∞} = free stream velocity
u = local velocity.
δ = boundary layer thickness
Then the momentum thickness θ is given by
The energy thickness δ_{e} is given by
The displacement thickness δ* is
Given that
δ = boundary layer thickness
δ* = displacement thicknes
δe = energy thickness
θ = momentum thickness
The shape factor H is given by
Shape factor is given by
Boundary layer flow separates from the surface if
Boundary layer separation occurs at adverse pressure gradient
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