The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is

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 thickness of thermal and hydrodynamic boundary layer is equal if Prandtl number is

A

Equal to one

B

Greater than one

C

Less than one

D

Equal to Nusselt number

The hydrodynamic and thermal boundary layers will merge, when

A

Prandtl number is one

B

Schmidt number tends to infinity

C

Nusselt number tends to infinity

D

Archimedes number is greater than 10000

At what value of Prandtl number, the hydrodynamic and thermal boundary layers of a fluid flowing over a heated plate will be identical?

A

1

B

> 1

C

None of these

At what value of Prandtl number, the hydrodynamic and thermal boundary layers are identical?

A

0.5

B

1

C

1.5

D

80

What is the ratio of displacement thickness to nominal thickness for a linear distribution of velocity in the boundary layer on a flat plate?

A

0.5

B

1

C

1.5

D

2

The property of a liquid which offers resistance to the movement of one layer of liquid over another adjacent layer of liquid, is called

A

Surface tension

B

Compressibility

C

Capillarity

D

Viscosity

The major reason of hydrodynamic noise (i.e., noise resulting from liquid flow) is

A

Pipe vibrations

B

Cavitation

C

Boundary layer separation

D

Fluctuation in liquid flow

The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is

A

d > m > e

B

d > e > m

C

e > m > d

D

e > d > m

The ratio of hydrodynamic boundary layer to thermal boundary layer thickness in case of liquid metals is

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