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00000ME200121902

What is displacement thickness? Derive the expression for displacement

thickness.

Explain separation of boundary layer. For the following velocity profiles,
determine whether the flow has separated, or on the verge of separation or will

attach with the surface.

(i) WU = 2(y/8)*- (४/8)
(11) ‏تا‎ = -2(y/8) + (1/8)? where 6 is the boundary layer thickness,

A pitot tube is inserted in a pipe of 30 cm diameter. The static pressure of the
tube is 10 cm of mercury (vacuum pressure).The stagnation pressure at the centre
of the pipe recorded by the pitot tube is 1.0 N/cm?. Calculate the rate of flow of
water through the pipe, if the mean velocity of flow is 0.85 times the central
velocity. Assume coefficient of the tube to be 0.98.
PART C

Answer any four questions, each carries 10 marks.
Derive the expression for force exerted by a jet striking at the centre of a
stationary flat vertical pate.
A jet of water 50 mm diameter having a velocity 40 m/s, strikes a curved fixed
symmetrical plate at the centre. Find the force exerted by the jet of water in the
direction of jet, if the jet is deflected through an angle of 120 ° at the outlet of the
curved plate.
A Pelton wheel is to be designed for a head of 60 m when running at 200 r.p.m.
The Pelton wheel develops 96 KW shaft power. The velocity of the buckets ‏.ا‎
‎0.45 times the velocity of jet, overall efficiency is 0.85 and coefficient of velocity
is 0.98.
Explain draft tube.
A Kaplan turbine produces 60,000 kW under a net head of 25 m with an overall
efficiency of 90 %. If the speed ratio is 1.6, flow ratio is 0.5, and the hub
diameter is 0.35 times the outer diameter, Find the diameter and speed of the
turbine.

Explain slip in reciprocating pumps. What is an indicator diagram?

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