FLUID MECHANICS PAPER

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FLUID MECHANICS (NEW) ME 208 B. Tech 4th Sem May 2k5

Max Marks 60

Note: Section A is compulsory. Attempt any Four questions from Section B and two from Section C

Section A Marks 2 each
1.

1. Define Compressibility.
2. How does viscosity of fluid vary with temperature?
3. What do you understand by hydrostatic equation?
4. Differentiate between centre of gravity and centre of buoyancy.
5. Distinguish between rotational flow and irrotational flow. Give one example of each.
6. Name the different forces present in a fluid flow. For the Euler’s equation of motion, which forces are taken into consideration?
7. What is free jet of liquid?
8. Define an orifice and a mouthpiece. What is the difference between the two?
9. What are the advantages of triangular notch over rectangular notch?
10. Explain the term dimensionally homogeneous equation.

Section B Marks 5 each

2. Develop the expression for relation between gauge pressure p inside a droplet of liquid and the surface tension.

3. When will centre of pressure and centre of gravity of an immersed plane surface coincide?

4. The diameters of a pipe at the inlet and outlet are 10 cm and 15 cm respectively. Find the discharge through the pipe if the velocity of water flowing through the pipe at inlet is 5 m/s. Determine also he velocity at outlet.

5. A pitot tube is used to measure the velocity of water in a pipe. The stagnation pressure head is 6 m and static pressure head is 5 m. Calculate the velocity of flow assuming the coefficient of tube is equal to 0.98.

6. How would you distinguish between hydrodynamically smooth and rough boundaries?

Section C Marks 10 each

7. Three pipes of different diameters and different lengths are connected in series to make a compound pipe. The ends of this compound pipe are connected two tanks whose difference of water level is H. If coefficient of friction of these pipes is same, derive the formula for the total head loss neglecting the minor losses.

8. (a) A jet of water issuing from a sharp edged vertical orifice under a constant head of 10 cm at a certain point, has the horizontal and vertical coordinates measured from the vena contracta as 20 cm and 10.5 cm respectively. Find the value of Cv if Cd = 0.60.
(b) How do you account for friction loss when applying Bernoulli’s equation to real fluid flow? 15,5

9. (a) Can Bernoulli’s equation be applied to forced vortex flow?

(b) The jets from a garden sprinkler are 25 mm in diameter and are normal to the 75 cm radius. If the pressure at the base of nozzle is 400 kPa, find the force of jet on the sprinkler. 5, 15