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Chemical Engineering - Fluid Mechanics

Exercise : Fluid Mechanics - Section 7
31.
Pick out the wrong statement pertaining to fluid flow.
The ratio of average velocity to the maximum velocity for turbulent flow of Newtonion fluid in circular pipes is 0.5.
The Newtonion fluid velocity in a circular pipe flow is maximum at the centre of the pipe.
Navier-Stokes equation is applicable to the analysis of viscous flows.
Hagen-Poiseuille equation is applicable to the laminar flow of Newtonion fluids.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
A Newtonion liquid (ρ = density, μ = viscosity) is flowing with velocity v in a tube of diameter 'D'. Let Δp be the pressure drop across the length 'L'. For a laminar flow, Δp is proportional to
L ρv2/D
L μ;V/D2
D ρv2/L
μ V/L
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
While starting a centrifugal pump, its delivery valve should be kept
opened.
closed.
either opened or closed ; it does not make any difference.
either opened or closed; depending on the fluid viscosity.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
For flow past a flat plate, if x is the distance along the plate in the direction of flow, the boundary layer thickness is proportional to
x
1/x
x
1/x
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.
Velocity at a certain point in case of streamline flow is
constant
independent of time
both (a) & (b)
neither (a) nor (b)
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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