QUESTION 17

i)

ii)

Derive an expression for Bernoulli's equation for an isentropic ideal gas, constant.

(4 marks)

Water flows at a rate of 20 l/s through a horizontal pipe whose diameter is constant at 3

cm. The pressure drop across a valve in the pipe is measured to be 2 kPa. Determine the

irreversible head loss of the valve, and the useful pumping power needed to overcome the

resulting pressure drop.

(6 marks)

=