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Posted By: santosh kumar kanugula Member Level: Gold Posted Date: 28 Jun 2008
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2007 Jawaharlal Nehru Technological University B.Tech Chemical engineering FLUID MECHANICS Question paper
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Code No: RR210801 Set No. 3
II B.Tech I Semester Supplementary Examinations, February 2007
FLUID MECHANICS
(Chemical Engineering)
Time: 3 hours Max Marks: 80
Answer any FIVE Questions
All Questions carry equal marks
? ? ? ? ?
1. (a) Why the pressure measurement is important. Classify the pressure measuring
devices. [6]
(b) Explain the construction, Principle of a simple U-tube manometer and derive
the equation for pressure drop. [10]
2. The water flows in a pipe line, whose diameter changes from 20cm at one end
A to 50 cm at another end‘B’ pressure at two ends are 78.5 KN/m2 and 58.9
KN/m2 respectively. The flow rate is 200m/sec End B is higher than end A by
3m. Determine the direction of flow. [16]
3. A small capillary with an inside diameter of 2.22 × 10-3 m and a length 0.317 m
is being used to continuously measure the flow rate of a liquid having a density of
875 kg/m3 and viscosity of 1.13×10-3 Pa s. The pressure drop reading across the
capillary during flow is 0.0655 m water of density 996 kg/m3. What is the flow rate
in m3/s if end e ect corrections are neglected. [16]
4. (a) Define hydraulic radius and equivalent diameter. Why equivalent diameter is
calculated? [8]
(b) Calculate the hydraulic radius for a circular tube and for an annular flow
between two concentric pipes. [8]
5. (a) Explain isothermal frictional flow with a neat diagram. [6]
(b) Derive the basic equation for isothermal frictional flow. [10]
6. Derive the expression for the terminal velocity of the spherical particles in the
Stroke’s law region. [16]
7. What is Pneumatic conveying. Explain. [16]
8. Water flowing at 1500cm3/sec in a 50mm diameter pipe is metered by means of a
simple orifice of diameter 25mm. If the coecient of discharge of the meter is 0.62,
what will be the reading on a mercury manometer connected to the meter. What
is the Reynold’s number for the flow in the pipe. Density of water is 1000kg/m3
viscosity of water=1mNs/m2.
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