A tube is used (as shown in the below figure) as a siphon to discharge an oil of specific gravity 0.8 from a large open vessel into a drain at atmospheric pressure. The velocity of oil through the siphon will be

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ESE Mechanical 2013 Official Paper - 1

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Answer 1

Calculation:

Considering the upper datum line, the pressure in the tube at the datum line will be equal to atmospheric pressure.

Now the exit is open to the atmosphere, hence the total head will be converted into velocity head.

Velocity of oil \(= \sqrt {2gh}\)

Here, h = 4+ 1.5 = 5.5 m

\(\therefore V = \sqrt {2 \times 9.81 \times 5.5}\)

\(= \sqrt {11 \times 9.81}\)

= 10.4 m/s