The frictional resistance in laminar flow does not depend on the

Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the

A

Length of the pipe

B

Diameter of the pipe

C

Density of the fluid

D

Velocity of the fluid

The total frictional resistance to fluid flow does not depend upon the

A

Roughness of the surface

B

Fluid pressure

C

Fluid density

D

Fluid velocity

Applying a pressure drop across a capillary results in a volumetric flow rate 'Q' under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is

A

$$\frac{{\text{Q}}}{2}$$

B

$$\frac{{\text{Q}}}{4}$$

C

$$\frac{{\text{Q}}}{8}$$

D

$$\frac{{\text{Q}}}{{16}}$$

The velocity at which the flow changes from laminar flow to turbulent flow is called

A

Critical velocity

B

Velocity of approach

C

Sub-sonic velocity

D

Super-sonic velocity

The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be (where D is the depth of flow)

A

0.423 D

B

0.577 D

C

0.223 D

D

0.707 D

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

The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be

A

Parabolic

B

Hyperbolic

C

Straight line

D

None of these

For the laminar flow of a fluid in a circular pipe of radius R, the Hagen-Poisseule equation predicts the volumetric flow rate to be proportional to

A

R

B

R²

C

R⁴

D

R^0.5

For laminar flow of a shear thinning liquid in a pipe, if the volumetric flow rate is doubled, the pressure gradient will increase by a factor of

A

2

B

> 2

C

$$\frac{1}{2}$$

Transition from laminar flow to turbulent flow is aided by the

A

Surface roughness and curvature (i.e.sharp corners)

B

Vibration

C

Pressure gradient and the compressibility of the flowing medium

D

All of the above

The frictional resistance in laminar flow does not depend on the

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