Related Questions

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 Re0.8.Pr0.4
B Nu = $$\frac{\pi }{2}$$ Gz
C Nu = $$\frac{2}{\pi }$$ Gz
D Nu = 2 Gz0.5
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 R0.5
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

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