The displacement thickness (δ*) for the velocity distribution in boundary layer is by (u/U) = (y/δ), where u = velocity at distance y from the plate and u = U at y = δ. If δ is boundary layer thickness, then δ* is
δ/2
\(\delta^*=\int_0^\delta(1-u/U)\,dy=\int_0^\delta(1-y/\delta)\,dy=\delta/2\).
Important Questions from Boundary Layer Theory
Friction drag is generally larger than the pressure drag in _______.
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:
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 _______.
As defined by Prandtl, in convective heat transfer, a thin layer next to the wall where shear stress is confined is called _____.
Thickness of laminar boundary layer on flat plate:
