Related Questions

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
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
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 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 free convection heat transfer transition from laminar to turbulent flow is governed by the critical value of the
A Reynold's number
B Grashoff's number
C Reynold's number, Grashoff's number
D Prandtl number, Grashoff's number
The flow in a pipe is neither laminar nor turbulent when Reynold number is
A Less than 2000
B Between 2000 and 2800
C More than 2800
D None of these
Critical value of the __________ number governs the transition from laminar to turbulent flow in free convection heat transfer.
A Grashoff
B Reynolds
C Both A & B
D Prandtl & Grashoff
Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of
A Grashoff number
B Grashoff number & Reynolds number
C Reynolds number
D Grashoff number & Prandtl number
The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is
A $$\frac{1}{2}$$
B $$\frac{2}{3}$$
C $$\frac{3}{2}$$
D $$2$$
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

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