Register Number
SATHYABAMA UNIVERSITY
(Established under section 3 of UGC Act,1956)
Course & Branch :B.Tech - CHEM
Title of the Paper :Fluid Mechanics
Sub. Code :SCHX1003 (2010-11)
Date :03/11/2012
Max. Marks:80
Time : 3 Hours
Session :FN
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1.
PART - A
(10 x 2 = 20)
Answer ALL the Questions
Distinguish between compressible and incompressible fluids.
Give examples.
2.
What are Newtonian and Non-Newtonian fluids? Give examples.
3.
What is meant by fully developed flow?
4.
Write a note on friction factor chart.
5.
Define free settling and hindered settling.
6.
Define minimum fluidization velocity.
7.
What is cavitation?
8.
Differentiate between a gate valve and a globe valve.
9.
What are full-bore meters and insertion meters? Give examples
10. Define the term vena contracta.
PART – B
Answer ALL the Questions
11.
(5 x 12 = 60)
(a) Derive an equation relating pressure and height, in a static
fluid and thus derive the barometric equation.
(b) A U-tube manometer is used to measure a pressure drop
across equipment. Liquid A is mercury of density 13590 kg/m3
and fluid B, flowing through the equipment and filling the
manometer leads is brine of density 1260 kg/m3. When the
pressures at the taps are equal the level of mercury in manometer
is 0.9 m below the equipment tap. Under operating condition the
gauge pressure at upstream is 0.14 bar, the pressure at
downstream tap is 250 mm Hg below atmospheric. What is the
difference in manometer level?
(or)
12. (a) Derive an expression for pressure difference in case of a Utube manometer.
(b) A simple U-tube manometer filled with mercury (specific
gravity 13.6), and the liquid above the mercury is carbon tetra
chloride (specific gravity 1.6). The difference in manometer level
reads 200 mm. what is the pressure difference over the
manometer in Newton’s per square meter?
13. Derive Bernoulli’s equation for the steady flow of an
incompressible fluid. How is this equation modified to calculate
pump work?
(or)
14. A pump draws solution of specific gravity 1.84 from a storage
tank through a 75-mm pipe. The efficiency of the pump is 60%.
The velocity in the suction line is 0.914 m/s. the pump discharges
through a 50-mm pipe to an overhead tank. The end of the
discharge pipe is 15.2 m above the level of the solution in the
feed tank. Friction losses in the entire piping system are 29.9
J/kg. (a) What pressure must the pump develop? (b) What is the
power developed by the pump?
15. Starting from the fundamentals derive the kozney-karman
equation for pressure drop through a packed bed.
(or)
16. Derive an expression for predicting the minimum fluidization
velocity.
17. Discuss in detail the construction and working of a centrifugal
pump.
(or)
18. Benzene at 38C is to be pumped from reservoir to an over head
tank, using a pump-set at the rate of 10m3/hr. The reservoir is at
atmospheric pressure. The gauge pressure in the pipe at the end
of the discharge is 345 KN/m2. The discharge is 3metres and the
pump suction is 1.2metres absolute level in the reservoir. The
suction and the discharge line is schedule 40 steel pipe of 4.12
cm pipe. Assume the mechanical efficiency of the pump is 60%,
Calculate (a) Head developed by the pump;( b) The total power
input; (c) The pump manufacturer specifies a required NPSH of
3.05m; will the pump be suitable for the service?
Data:
Density of Benzene 865 kg/m3;
Vapor pressure of Benzene at 30C is 26.2 kN/m2
19. With a neat sketch, explain the working of a venturimeter.
(or)
20. Write short notes on
(a) target meters (b)vortex shedding meter (c) turbine meters