0 B3C076 Total Pages:2

(b) An oil of specific gravity 0.8 is flowing through a venturimeter having inlet diameter 20
cm and throat diameter 10 cm. The oil-mercury differential manometer shows a reading
of 15 cm. Calculate the discharge of oil through the horizontal venturimeter.

Take Cd=0.98 (4)

7. (a) What are minor losses? (4)
(b) Derive Darcy-Weisbach equation (6)

8. (a) Define hydraulic gradient line and total energy line. (4)

(b) A crude oil of viscosity 0.97 poise and relative density 0.9 is flowing through a horizontal
circular pipe of diameter 100 mm and of length 15 m. Calculate the difference of pressure
at the two ends of the pipe, if 100kg of oil is collected in a tank
in 25 seconds. (6)

PART ^

(Answer any four questions)

9 With a neat sketch explain the development of boundary layer over a horizontal flat plate
which is kept in a flow field. (10)

For the velocity profile in a laminar flow प [ $11111 ४ OO . Obtain the expression for

ए 01200
boundary layer thickness, shear stress, drag force on one side of the plate and coefficient
of drag in terms of Reynolds number. (10)

11 Describe the methods of preventing the separation of boundary layer. (10)

12 The pressure drop AP in flow of incompressible fluid through rough pipes is found to
depend on the length L, average velocity प, fluid density ೧, dynamic viscosity ம, diameter

D and average roughness height €. Obtain a dimensionless expression using 7 - theorem
(10)

13. Explain similarity requirements between the model and prototype (10)

14. Water tunnel operates with a velocity of 3 m/s at the test section and power required was
3.75 kW. If the tunnel is to operate with air, determine for similitude the flow velocity and
the power required. (10)

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