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WorksheetsY4 Boundary Layer Quiz
Total questions: 10
Worksheet time: 5mins
A boundary layer forms at a surface due to:
Shear stresses in the fluid.
Normal pressures acting on the surface.
The distance normal to the wall to a point where the flow velocity has essentially 0.99 of the freestream velocity is called the:
displacement thickness
momentum thickness
boundary layer thickness
friction thickness
Which do you think is larger?
the displacement thickness
the momentum thickness
Ignoring viscous effects will result in:
Inaccurate predictions of pressure drag only.
Inaccurate predictions of skin friction drag only.
Inaccurate predictions of skin friction drag, pressure drag, and lift.
Inaccurate predictions of lift only.
This expression applies for _____ boundary layers.
laminar
turbulent
For flow over a flat plate, the transition region is large compared with the laminar and turbulent regions.
True
False
Which thickness is representative of the friction force experienced by the fluid in the boundary layer?
The physical boundary layer thickness.
The displacement thickness.
The momentum thickness.
This expression for skin-friction coefficient is applicable for:
laminar flow.
turbulent flow.
transitional flow.
inviscid flow.
The velocity profile shown is for a ____ boundary layer.
laminar
turbulent
When transition occurs, we can assume that the ____ remains constant.
displacement thickness
momentum thickness
physical boundary layer thickness
