Gujarat Technological University 2009 B.E Chemical Engineering Fluid Flow Operation - Question Paper

1
Seat No.: _____ Enrolment No.______
GUJARAT TECHNOLOGICAL UNIVERSITY
B.E. Sem-III(Chemical)Examination December 2009
Subject code: 130502 Subject Name: Fluid Flow Operation
Date: 19 / 12 /2009 Time: 11.00 am – 1.30 pm
Total Marks: 70
Instructions:
1. Attempt all ques..
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
4. Draw neat sketches/figures wherever needed
Q.1 (a) ans the following:- [07]
1. Convert one Pa to psi
2. Convert 1Pa-s to cP
3. The viscosity of the liquid increases with the temperature (True / false)
4. provide full form of NPSH, NPSHA
5. For fully developed flow the kinetic energy correction factor is _____.
6. one cusec = 1ft3/sec. (True / false)
7. Which pump can be used for handling slurries?
(b) discuss any 1 method of dimensional analysis giving an example. [07]

Q.2 (a) The temperature of earth’s atmosphere drops about 5°C every 1000 m of
elevation above the earth’s surface. If the air temperature at ground level is 15°C
and the pressure is 760 mmHg, At what elevation is the pressure is 570 mmHg?
presume that the air behaves as an ideal gas.[07]
(b) For the subsequent situations of steady flow, determine whether the flow is
laminar or turbulent:
(i) Water having viscosity of 1.310 cP flowing at an avg. velocity of 2m/s in
a 100-mm pipe
(ii) Polymer melt with a density of 900 kg/m3 and viscosity of 1Pa-s flowing at
0.2 m/s in a 20 mm tube.[07]
OR
(b) Derive Hagen-Poiseuille formula. [07]

Q.3 (a) What is hydraulically smooth tube? explain effect of roughness on friction
factor.[07]
(b) A pump draws a solution of density 1800 kg/m3
is flowing from point A to point
B The velocity in the suction pipe of 75 mm diameter is 0.9 m/sec. The pump
discharges through a discharge pipe of 50 mm diameter to an overhead tank
(point B) which is 15 m above point A. The frictional losses in the entire piping
system are 30 J/kg .If point A and B are at atmospheric pressure, what pressure
must the pump develop? (Assume pump efficiency = 60% .[07]
OR
Q.3 (a) Write in detail about drag and drag coefficient. [07]
(b) explain construction and working of an orifice meter and derive formula for
volumetric flow rate for the identical.[07]

Q.4 (a) Write in brief about Gate valves and Globe valves .[07]
(b) explain Suction lift , Cavitation and Priming in centrifugal pumps. [07]
OR
Q.4 (a) explain the construction and working of a rotameter. [07]
(b) discuss the principle and working of coriolis meters. [07]

Q.5 (a) discuss Skin friction and form friction. [07]
(b) Write a brief note on kinds of fluidization and its application in chemical
industry.[07]
OR
Q.5 (a) describe Hydraulic radius derive the expression for equivalent diameter for a
square duct of dimension ‘a’ unit.[07]
(b) Write a brief note on Fans, blowers and compressors used in chemical industry. [07]

Earning:   Approval pending.