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00000BT201121902

The height from the centre of pipe B to the mercury level on the left limb of the
manometer is | m. Calculate the difference in mercury level in the manometer.
Derive the expression for capillary rise and capillary depression. Explain how
surface tension plays a dominant role in the phenomena.
PART B

Answer any two full questions, each carries 15 marks.
In a two-dimensional, incompressible flow the fluid velocity components are
given by: u = x — 4y and v = -y - 4x. Show that the flow satisfies the continuity
equation. Assuming potential flow (irrotational), obtain the expression for the
velocity potential.
Oil flows from section | to 2 through a varying cross sectional area pipe line in
which the diameter at section | is 20 cm and that at section 2 is 500 cm. Section
2 is 4 m above section 1. Pressure gauges mounted at section 1 and 2 indicates 1
kgf/em? and 0.6 kgf/em? respectively. If the discharge through the pipe is 200
litre/s. Comment on the direction of flow. Your answer should be supported
with necessary calculations. Also compute the loss of head in metre of water
column and the energy loss in J/kg.
Explain the concept of boundary layer and sketch the boundary layer
development for (i) flow through pipes and (ii) for flow over flat plates.
Explain the importance and features of Moody diagram
List the assumptions involved in using the Hagen Poiseuille equation and derive
the equation. Deduce the equation for average velocity and maximum velocity
for laminar pipe flow.
List any five joints and fittings used in pipe lines with their purpose of each.
List and define the terms Kinetic energy correction and momentum correction
factor associated with Bernoulli equation. Derive the expression for the kinetic
energy correction factor.

PART ட்‌

Answer any two full questions, each carries 20 marks.
Explain the features of fluidization (with appropriate sketches) based on the
following regimes (i) Incipient fluidization (ii) Particulate fluidization (140)
Aggregate fluidization (iv) Slugging in fluidized beds

Water at 24 °C is flowing past a long cylinder at a velocity of 1 m/s in a large

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