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
Related Mcqs:
- Prandtl mixing length is___________________?
A. Applicable to laminar flow problems
B. A universal constant
C. Zero at the pipe wall
D. None of these - For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance) ?
A. V/Vmax = (x/r)1/7
B. V/Vmax = (r/x)1/7
C. V/Vmax = (x.r)1/7
D. None of these - Prandtl number is a measure of the__________________?
A. Heat conduction to viscosity of a fluid
B. Cp/Cv of a fluid
C. Elastic force to pressure force in the fluid flow
D. Inertial force to elastic force in the fluid flow - The Prandtl Pitot tube measures the__________________?
A. Velocity at a point in the flow
B. Pressure at a point
C. Average flow velocity
D. Pressure difference in pipe flow - Power required for mixing Newtonian fluids is a function of the _________________?
A. Speed of impeller, diameter of impeller & viscosity
B. Density & viscosity of fluid only
C. Density of fluid, viscosity of fluid & impeller dia only
D. None of these - Baffles in mixing tanks are provided to__________________?
A. Reduce swirling and vortex formation
B. Increase the structural strength of the tank
C. Aid in rotational flow
D. None of these - The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the _____________ length?
A. Equivalent
B. Transition
C. Prandtl mixing
D. None of these - What is the shear rate at the pipe wall, in case of laminar flow of Newtonian fluids in a pipe of diameter ‘D’ & length ‘L’ incurring a pressure drop ‘Δp’ with average velocity ‘Vavg’ ?
A. D Δp/8L
B. D Δp/4L
C. 8 Vavg/D
D. 4 Vavg/D - Equivalent length of a pipe fitting is____________________?
A. Dependent on Reynolds number
B. Independent of Reynolds number
C. Dependent on the length of the pipe
D. None of these - Applying a pressure drop across a capillary results in a volumetric flow rate ‘Q’ under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is____________________?
A. Q/2
B. Q/4
C. Q/8
D. Q/16
