# 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? 

(b) Outline the procedure for Rayleigh’s method and Buckingham method used in dimension analysis. 

2. Explain the behavior of non Newtonian fluids with the help of plot and give examples. 

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

velocity is double the average velocity. 

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. 

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? 

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. 

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. 

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.