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 $$\frac{{\text{f}}}{4}$$
For pipes, laminar flow occurs when Reynolds number is
A Less than 2000
B Between 2000 and 4000
C More than 4000
D Less than 4000

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