JNTU Exam Paper Fluid Mechanics Nov 2008

JNTU Exam Paper Fluid Mechanics Nov 2008

November 2008

(Chemical Engineering)

SET-2

 

 

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. Explain the behavior of non Newtonian fluids with the help of plot and give examples. [16]

3. Prove that an incompressible fluid flowing as a laminar flow in a tube the maximum

velocity is double the average velocity. [16]

 

4. Under conditions of laminar flow , the friction factor is given by 16/ Ne .Derive an

expression for the pressure drop per unit length in terms of the pipe diameter, ‘d’,

the average velocity ‘u’, the density and the viscosity of the fluid. [16]

 

5. Air at 1.7 atm gauge and 150C enters a horizontal steel 75mm pipe, 70 m long . The velocity at the entrance of the pipe is 60 m/s . Assuming isothermal flow, what is the pressure at each discharge end of the line? [16]

6. Calculate the terminal velocity of 0.3 mm spherical particle in water under free

settling conditions. Particle density is given as 1.8 gm/cc, the water density and

viscosity are given as 1 g/cc and 1 cp respectively. Calculate the criteria factor ‘k’

and decide the region in which the settling takes place. Applying the appropriate

expression for terminal velocity. [16]

 

7. The fluidized bed expands as the superficial velocity increases and pressure drop per

unit length decreases with increase in porosity. Explain with respect to particulate

fluidization and Bubbling fluidization. [16]

 

8. Sulphuric acid of specific gravity 1.3 is flowing through a pipe of 5 cm ID . A thin

tipped orifice os 1cm diameter is fitted in the pipe and the differential pressure

shown by the mercury manometer is 10 m .Calculate the weight of acid flowing per

hour . Take the orifice coefficient as 0.61. [16]

 

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