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C1127 Pages 2

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
THIRD SEMESTER B.TECH DEGREE EXAMINATION(S), MAY 2019
Course Code: ME203
Course Name: MECHANICS OF FLUIDS

PARTA
Answer any three full questions, each carries 10marks.

a) Deduce Pascal’s Law.

b) Dynamic viscosity of oil used for lubrication between a shaft (journal) and

bearing is 6 poise. The shaft is of diameter 400 mm and rotates at 190 rpm.
Calculate the power lost in the bearing for 90 mm long Journal bearing
arrangement. Thickness of oil is 1.5 mm.

Derive an expression for total pressure and centre of pressure on an inclined
plane surface submerged in a liquid.

How can you classify fluid flow?

The velocity vector for 2D incompressible , fluid flow is given by
V = ௫33 +2x — x’y)i + (xy” — 2y — x7/3)j
Find a) whether the flow is possible or impossible.
b) Whether the flow is rotational or irrotational.
PART ‏تا‎

Answer any three full questions, each carries 10marks.
Derive Hagen Poiseuille equation for fully developed laminar flow in a circular
pipe.
A pipe 300 m long has a slope of | in 100 and tapers from 1.2 m diameter at the
higher end to 0.6 m diameter at the lower end. Quantity of water flowing is 5400
litres per minute. If the pressure at the higher end is 68.67 kPa. Find the pressure
at the lower end.
An oil of specific gravity 0.9 and viscosity 10 poise is flowing through a pipe of
diameter 110 mm. The velocity at the centre is 2 m/s, find :
(i) the pressure gradient in the direction of flow
(ii) shear stress at the pipe wall; (iii) Reynold’s number; and (iv) velocity at a
distance 30 mm from the wall.
Explain the principle of venturi meter with a neat sketch and establish an
expression for the rate of flow through it.

PART C

Answer any four full questions, each carries 10marks.
What do you understand by boundary layer? Illustrate with reference to flow
over flat plate.
Define the following

i. Laminar Boundary Layer
11. Turbulent boundary Layer
111. Laminar Sub Layer

iv. Boundary Layer Thickness

Air flows over a flat plate of 1 m x Im ata velocity of 6 m/s. Determine
(a) Boundary layer thickness at the end of the plate
(b) Shear stress at the middle of the plate

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Duration: 3 Hours

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