Reynolds number is significant in

A Supersonics, as with projectile and jet propulsion
B Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.
C Simultaneous motion through two fluids where there is a surface of discontinuity, gravity forces, and wave making effect, as with ship's hulls
D All of the above

Correct Answer: Full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc.

Bissoy MCQ
#Mechanical Engineering #Hydraulics And Fluid Mechanics In ME

Related Questions

When the ratio of the Grashoff number and to the square of Reynolds number is one, the dominant mechanism of heat transfer is
A Free convection
B Entry length problem in laminar forced conduction (developing thermal boundary layer)
C Mixed convection (both free and forced)
D Forced convection
The product of Reynolds number and Prandtl number is known as
A Stanton number
B Biot number
C Peclet number
D Grashoff number
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as
A Re0.33
B Re0.53
C Re0.83
D Re
The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to
A N°
B N1
C N2
D N3
At high Reynolds number
A Inertial forces control and viscous forces are unimportant
B Viscous forces predominate
C Inertial forces are unimportant and viscous forces control
D None of these
At low Reynolds number
A Viscous forces are unimportant
B Viscous forces control
C Viscous forces control and inertial forces are unimportant
D Gravity forces control
Creeping flow around a sphere is defined, when particle Reynolds number is
A [

A.

B.

B > 2.5
Laminar flow of a Newtonion fluid ceases to exist, when the Reynolds number exceeds
A 4000
B 2100
C 1500
D 3000
According to Reynolds analogy, Stanton number is equal to (where, f = Fanning friction factor)
A 2f
B f
C $$\frac{{\text{f}}}{2}$$
D $$\frac{{\text{f}}}{4}$$
Reynolds number is the ratio of
A inertia forces to viscous forces
B inertia forces to buoyancy forces
C viscous forces to buoyancy forces
D viscous forces to surface tension

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