Experimental study of laminar fluid flow through a circular tube was conducted by

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 ratio of average fluid velocity to the maximum velocity in case of laminar flow of a Newtonion fluid in a circular pipe is

A

0.5

B

1

C

2

D

0.66

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 velocity distribution for laminar flow through a circular tube

A

is constant over the cross-section

B

varies linearly from zero at walls to maximum at centre

C

varies parabolically with maximum at the centre

D

none of the above

Asymptotic conditions is reached, when for a fluid flowing in laminar flow through a long tube

A

Exit-fluid temperature > wall temperature

B

Exit fluid temperature

C

Exit fluid temperature = wall temperature

D

Graetz number > 100

For a liquid in laminar flow through a very long tube, when the exit fluid temperature approaches the wall temperature, the equation to be used is

A

Nu = 0.023 Re^0.8.Pr^0.4

B

Nu = $$\frac{\pi }{2}$$ Gz

C

Nu = $$\frac{2}{\pi }$$ Gz

D

Nu = 2 Gz^0.5

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

In case of laminar flow of fluid through a circular pipe, the

A

Shear stress over the cross-section is proportional to the distance from the surface of the pipe

B

Surface of velocity distribution is a paraboloid of revolution, whose volume equals half the volume of circumscribing cylinder

C

Velocity profile varies hyperbolically and the shear stress remains constant over the cross-section

D

Average flow occurs at a radial distance of 0.5 r from the centre of the pipe (r = pipe radius)

What is the ratio of total kinetic energy of fluid passing per second to the value obtained on the basis of average velocity (for laminar flow through a circular pipe)?

A

0.5

B

1

C

1.5

D

2

Fanning friction factor for laminar flow of fluid in a circular pipe is

A

Not a function of the roughness of pipe wall

B

Inversely proportional to Reynolds number

C

Both A and B

D

Neither A nor B

Experimental study of laminar fluid flow through a circular tube was conducted by

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