JNTU question papers B -Tech Ist Sem -Fluid mechanics for chemical engineering – Nov 2008

JNTU II B.Tech I Semester Supplimentary Examinations, November 2008

FLUID MECHANICS FOR CHEMICAL ENGINEERING

(Chemical Engineering) SET-1

1. (a) Derive the condition for hydrostatic equilibrium and deduce the barometric equation.

(b) What are the required characteristics of the manometric fluid.

2. Define the following:

(b) Uniform and Non-Uniform flow

(c) Laminar and Turbulent flow

(d) Stream lines and stream tube.

3. What is Reynolds number? Explain the variation of friction factor with Reynold’s

number for turbulent flow, in smooth and rough pipes along with corresponding formulae.

4. Methane gas is being pumped through a 305m length of 52.5mm diameter steel pipe at a rate of 41.0kg/m2-s.The inlet pressure is 345kPa abs. Assume isothermal flow at 288.8K. (?methane= 1.045 × 10?5pa ? sec, f = 0.0014).

(a) Calculate the pressure at the end of the pipe.

(b) Calculate the maximum velocity that can be obtained at these conditions.

5. (a) Give a brief explanation on:

i. Void fraction of bed

ii. Tortousity

(b) A gas flows in a conduit vertically at a velocity of 200m/sec.What is the maximum particle size of density 1.2g/cc,that may be carried by it?(?gas= 1.15 ×10?3 Kg/m3 and ?gas= 2.25×10?5pa.sec) .Assume Stoke’s law regime and check for the validity of Stoke’s Law.

6. (a) Discuss about various types of fluidization.

(b) Explain the phenomena of fluidization with the help of a neat sketch.

7. Briefly discuss the following:

(a) leak proof blank flange.

(b) Schedule number and BWG gauge.

(c) Rotary positive displacement pump

(d) cavitation.

8. Explain the purpose and working principle of a pitot tube. Derive the expression

for calculating the point velocity of an incompressible fluid flowing through a duct using a pitot tube.