Page 106 - ebook fluid mechanics_finalize

FLUID MECHANICS

Example 4.16

A tank 1.8 m high, standing on the ground, is kept full of water. There is an orifice in its

vertical site at depth, h m below the surface. Find the value of h in order the jet may strike
the ground at a maximum distance from the tank.

Solution to Example 4.16

x v= t

and

1
t
y = g 
2

By eliminating the equation give,

v 2 2 y
x =
g

y = 1.8 – h

h = head of liquid above the orifice

v
Cv =
2 gH

t = time for particle to travel from vena contracta A to point B

Putting y = 8.1 − h and v = C v ( gh2 )

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