# JNTU,B Tech Semester Fluid Mechanics, November 2008

JNTU PAPERS

JNTU,B.Tech I Semester Fluid Mechanics, November 2008

(Chemical Engineering)

SET-3

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. A Pipe line of 20cm dia, branches into 2 pipes having 10cm and 5cm dia respectively.

If the flow of fluid in the larger pipe is 2/3 of the main pipe and the remaining in

the smaller pipe. If the maximum velocity in either of the pipes and the main pipe

does not exceed 3m/sec. Find the velocity in each pipe and the rate of discharge

in the main pipe. 

3. (a) Differentiate between incompressible and compressible fluids. Give examples.

(b) Write the equations for fanning friction factor and Darcy’s friction factor.

(c) A fluid is flowing though a cylindrical pipe of radius ‘R’ explain the distribution

of velocity and shear stress. What are the force which influences the system.

[4+4+8]

4. An oil having a viscosity of 0.048 kg/ms flows through a 50 mm diameter tube at

an average velocity of 0.12 m/s . Calculate the pressure drop in 65 m of tube and

the velocity at 10mm from the tube wall. 

5. For an isentropic flow write the equations for the following:

(a) Velocity in a nozzle 

(b) Mach number 

(c) pressure ratio 

(d) Mass velocity 

6. Estimate the frictional pressure drop per meter of bed length for a liquid flowing

through a packed bed made of 2.2 mm diameter spheres.

DATA: Bed porosity = 0.32

Mass flux of liquid = 54000kg/m3

Liquid density = 1000kg/m3

Viscosity = 1 Cp. 

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.