Related Questions

Prandtl and Reynold's analogies are identical for Prandtl number value of
A 0
B 0.5
C 1
D 5
Prandtl and Reynolds analogy are same, when Prandtl number is
A 0.5
B 1
C > 2
D 1.5
For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance).
A $$\frac{{\text{V}}}{{{{\text{V}}_{\max }}}} = {\left( {\frac{{\text{x}}}{{\text{r}}}} \right)^{\frac{1}{7}}}$$
B $$\frac{{\text{V}}}{{{{\text{V}}_{\max }}}} = {\left( {\frac{{\text{r}}}{{\text{x}}}} \right)^{\frac{1}{7}}}$$
C $$\frac{{\text{V}}}{{{{\text{V}}_{\max }}}} = {\left( {{\text{x}} \times {\text{r}}} \right)^{\frac{1}{7}}}$$
D None of these
Prandtl mixing length is
A Applicable to laminar flow problems
B A universal constant
C Zero at the pipe wall
D None of these
The Prandtl mixing length is
A Zero at the pipe wall and is a universal constant
B Independent of radial distance from the pipe axis
C Independent of the shear stress
D Useful for computing laminar flow problems
The mixing vat in a factory receives liquid ingredients through six separate value--- labeled R.S.T.U,Y and Z -- each of which has exactly two settings: open and closed.The mixing vat operator must ensure that each valve is set open or closed according to the following conditions: If T is open, both S and Z must be closed, R and Z cannot both be closed at the same time; If Y is closed, Z must also be closed;S and U cannot both be open at the same time. Which of the following, if given to the mixing vat operator as an instruction, would not determine the setting of any other valve ?
A S must be open
B T must be open
C U must be open
At what value of Prandtl number, conduction is negligible in the turbulent core of a fluid flowing through a heated pipe?
A 0.5
B > 0.6
Heat transfer by conduction in the turbulent core of a fluid flowing through a heated pipe is negligible, if the value of Prandtl number is
A 0.2
B 0.4
C 0.6
D 0.8
The velocity at which the flow changes from laminar flow to turbulent flow is called
A Critical velocity
B Velocity of approach
C Sub-sonic velocity
D Super-sonic velocity
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

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