Related Questions

The ratio of the thickness of thermal boundary layer to the thickness of hydrodynamic boundary layer is equal to (Prandtl number) n, where n is equal to
A $$ - \frac{1}{3}$$
B $$ - \frac{2}{3}$$
C 1
D $$-1$$
Thickness of thermal boundary layer is more compared to that of hydrodynamic boundary layer, when the value of Prandtl number is
A 1
B > 1
C > 5
The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is
A [

A.

B. 1

B > 1
C 2
At the point of boundary layer separation in fluid flow, the
A Shear stress is maximum
B Velocity gradient is flat
C Density variation is maximum
D Shear stress is zero
In fluid flow, the boundary layer separation can not occur
A In case of boundaries experiencing form drag
B At points of abrupt changes in the flow directions
C In laminar flow
D None of these
The effect of solid boundary on the fluid flow is confined to the boundary layer, except for fluids
A Having high viscosities
B Moving at low velocities
C Both A and B
D Neither A nor B
Routers operate at layer _____. LAN switches operate at layer _____. Ethernet hubs operate at layer _____. Word processing operates at layer _____.
A 3, 3, 1, 7
B 3, 2, 1, none
C 3, 2, 1, 7
D 3, 3, 2, none
E All of the above
Boundary layer separation is caused by the
A Reduction of pressure to vapour pressure
B Boundary layer thickness reducing to zero
C Adverse pressure gradient
D Reduction of pressure gradient to zero
In convection heat transfer from hot flue gases to water tube, even though flow may be turbulent, a laminar flow region (boundary layer of film) exists close to the tube. The heat transfer through this film takes place by
A Convection
B Radiation
C Conduction
D Both convection and conduction
For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to
A $$\sqrt {\text{x}} $$
B $$\frac{1}{{\sqrt {\text{x}} }}$$
C x
D $$\frac{1}{{\text{x}}}$$

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