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WorksheetsAA W1 - BL Thickness
Total questions: 10
Worksheet time: 3mins
Name
Class
Date
1.
The viscosity of a fluid is:
a)
The mass of the fluid per unit volume.
b)
A measure of the fluid’s resistance to flow.
c)
The force exerted by a fluid on a surface per unit area.
d)
A measure of the kinetic energy of the fluid molecules.
2.
The units of dynamic viscosity are:
a)
kg/s
b)
kg/m3
c)
m2/s
d)
kg/ms
3.
A boundary layer forms at a surface due to:
a)
Shear stresses in the fluid.
b)
Normal pressures acting on the surface.
4.
Ignoring viscous effects will result in:
a)
Inaccurate predictions of pressure drag only.
b)
Inaccurate predictions of skin friction drag only.
c)
Inaccurate predictions of skin friction drag, pressure drag, and lift.
d)
Inaccurate predictions of lift only.
5.
As viscous flow transitions from laminar to turbulent, the boundary layer thickness will:
a)
Stay the same.
b)
Increase.
c)
Decrease.
6.
The effects of viscosity are often negligible outside the boundary layer.
a)
True
b)
False
7.
The edge of the boundary layer is defined as the point at which the fluid velocity equals what % of the freestream velocity?
a)
100%
b)
90%
c)
99%
d)
95%
8.
The boundary layer displacement thickness is related to:
a)
The drop in momentum due to the boundary layer.
b)
The drop in mass flow rate due to the boundary layer.
9.
Which do you think is larger?
a)
the displacement thickness
b)
the momentum thickness
10.
A shape factor is used in boundary layer flow to help to differentiate laminar and turbulent flow.
a)
True
b)
False
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