Andhra University 2007 B.E fluid mechanics - exam paper
Wednesday, 01 May 2013 04:10Web
II Year B.E./B.Tech Degree exam
FLUID MECHANICS
(Chemical Engineering)
Time: three hours Max.Marks: 75
ques. one is compulsory
ans any 4 from ques. two to 8
All ques. carry equal marks
1. Write briefly about the subsequent : (5 x three = 15)
a) likeness
b) kinds of turbulence
c) Boundary layer separation
d) Drag
e) Valves
2. a) Derive an expression for the estimation of pressure drop
in a centrifuge.
b) A centrifuge bowl 250 mm internal diameter is turning
at 4000 rpm. It contains a layer of chlorobenzene
50 mm thick. If the density of chlorobenzene is
1109 kg/m3 and the pressure is exerted on the wall of
the centrifuge bowl?
3. a) describe boundary layer and explain its formation.
b) With the help of neat sketches, discuss the laminar and
turbulent flows in boundary layers.
c) explain boundary layer separation and wake formation.
4. a) discuss the difference ranging from a fan, a blower and a
compressor.
b) define with a neat diagram, the working principle of
a rotary pump.
17
5. Benzene at 380C is pumped from a reservoir at a rate of 9
m3/h and discharged against a gauge pressure of 345 kPa.
The discharge line is made with 1.5 inch ID pipe. The discharge
point is 10 ft and the pump suction is four ft above the level in the
reservoir. The friction in the suction line is 3.5 kPa and in the
discharge line is 38 kPa. The density of benzene is 865 kg/
m3 and its vapor pressure is 26 kPa. compute the developed
head of the pump and the total power input assuming the
efficiency of the pump to be 60 percent.
6. a) elaborate the advantages and disadvantages of venturi
meter over orifice meter?
b) A sharp edged orifice having a diameter of 0.0566 m is
installed in a 0.1541 m diameter pipe through which oil
having a density of 878 kg/m3 and a viscosity of 4.1 cP
is flowing. The pressure difference is 93 kPa. compute
the volumetric flow rate in m3/s? presume C0 = 0.61.
7. a) What is terminal velocity? Differentiate ranging from
hindered settling and free settling.
b) Urea pellets are made by spraying drops of molten urea
into cold gas at the top of a tall tower and allowing the
material to solidify as it falls. Pellets six mm in diameter
are to be made in a tower 25 m high containing air at
200C. The density of urea is 1330 kg/m3. What would
be the terminal velocity of the pellets, assuming freesettling
conditions?
8. discuss in detail different pipe fittings employed in chemical
process industries.
Earning: Approval pending. |