JNTU Fluid Mechanics Question Paper November 2008

JNTU Fluid Mechanics Question Paper November 2008

(Chemical Engineering)

SET-1

1. (a) What is the importance of dimensional analysis? [6]

(b) Outline the procedure for Rayleigh’s method and Buckingham method used

in dimension analysis. [10]

 

2. (a) Describe the process of Boundary layer formation, also describe the process of

Boundary layer separation. [10]

(b) Define the terms fully developed flow and transition length. [6]

 

3. (a) Show that for a laminar flow Newtonian fluid the friction factor is given by

16/NRe. [12]

(b) What is the physical significance of Hagen Poiseuille equation. [4]

 

4. The maximum velocity is measured as 3 m/s in a 0.1 m diameter tube. If the

fluid flowing has a density of 1260 kg/m3 and a viscosity of 0.9 Ns/m2 , determine

whether the flow is laminar or turbulent and determine the pressure gradient. [16]

 

5. In a single stage compressor:

Suction pressure : 101.3kN/m2

Suction temperature : 283 0k

Final pressure : 380kN/m2

Compression is adiabatic

If each new charge is heated 180k by contact with the clearance gases, calculate the

maximum temperature attained in the cylinder. [16]

 

6. What is terminal velocity. Derive the equation for terminal velocity under the

influence of centrifugal field. [16]

 

7. What is Pneumatic conveying. Explain. [16]

 

8. A pitot tube having a coefficient of 0.95 is inserted in the central line of a long pipe

of 250mm diameter in which crude oil of density 0.9 gm/cc and viscosity 16.3 cp

is flowing. Calculate the maximum velocity of the oil in the pipe if the differential

pressure in the manometer is 5cm of water. [16]

 

 

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