Kurukshetra University 2009 B.Tech Civil Engineering Fluid Machines (ME-303E) - Question Paper

Fluid machines (ME-303E)
Time: 3 Hours Maximum Marks: 1OO
Note: - Attempt any 5 questions, at lowest 1 ques. from every part. All ques. carry equal
marks.
PART - A
1. (a) discuss what do you understand by the terms Newtonian and non-Newtonian fluids. provide
examples of 2 fluids in every category. (5)
(bl A ship 63 m long and nine m broad has a displacement of 16000 KN- When a weight of 2OO KN is
moved across the deck through a distance of 5.4 m, the ship is tilted through 5°. The second
moment of area of the water line part about its fore and aft axis is 75 percent of that of circumscribing
rectangle, and centre of buoyancy is 2.1 m beneath the water line. Determine:
(i) Metacentric Height, and (ii). The position of centre of gravity of ship. (15)
2. (al Distinguish ranging from path lines, stream lines and streak lines. (5)
(bl For a three-dimensional flow the velocity distribution is provided by u = -x, v = three - y and
w = three - z. What is the formula of a stream line passing through (l , 2, 2) ? (15)
PART - B
3. (a) What is the difference ranging from a venturimeter and an orifice meter? (5)
(b) A vertical venturimeter carries a liquid of relative density O.8 and has inlet and throat diameters of
15O mm and 75 mm respectively. The pressure connection at the throat is 150 mm above that at the
inlet. If the true rate of flow is 4O litres/sec and the Cd = 0.96, compute the pressure
differencebetweeninletarrdthroatinN/m2. (15)
4. A long circular cylinder lies in an air stream having a velocity of 6O m/sec. In addition there is a flow
around the cylinder with circulation of 4OO m2/sec (clockwise). Neglecting all viscous and compressibility
effects determine the
(i). maximum velocity due to air stream alone
(ii). velocity at the cylinder surface due to the circulation alone,
(iii). Maximum velocity
{iv). location of stagnation points.
(v). maximum and minimum pressures.
(vi). lift force per unit length of cylinder.
The density of air is 1.22 Kg/m3 and the cylinder diameter is 1.2 m. (20)
PART - C
5. (a). What is the difference ranging from a laminar flow and a turbulent flow ? (5)
(b). An oil dash pot consists of a piston moving in a cylinder having oil. This arrangement is used to damp
out the vibrations. The piston falls with uniform speed and covers 5O mm in 100 seconds. If an additional
weight of 1.334 N is placed on the top of the piston, if falls through 50 mm in 86 seconds with uniform
speed. The diameter of piston is 75 mm and its length is 100 mm. The clearance ranging from the piston and
the cylinder is I.2 mm which is uniform throughout. obtain the viscosity of the oil. (15)
6. The pipes of diameter D and d of equal length L are considered. If the pipes are organizes in parallel,
the loss of head for either pipe for a flow of Q is h. If the pipes are organizes in series and the identical
volume e flows through them, the loss of head is H. lf d = 0.5 D, obtain the percentage of total flow through
every pipe when placed in parallel and the ratio of H to h neglecting minor losses and assuming friction
coefficient to be constant. (20)
PART - D
7. How are the thickness of boundary layer, shear stress and the drag force along the flat plate
determined by Von-Karman momentum equation? (20)
8. (a) Derive an expression for the velocity distribution for turbulent flow in smooth pipes. (8)
(b) The velocity of flow in a badly corroded 7.5 cm pipe is obtained to increase 2O percent as a pitot tube is
moved from a point one cm from the wall to a point two cm from a wall. Estimate the height of roughness. (12)

Earning:   Approval pending.