*Water enters an evaporator with a quality 20% and flow through a vertical pipe with a diameter 20 mm and length 4.5 m. Heat is added uniformly along the pipe length with the gradient of 15 kW/m. The pressure at the pipe inlet was 7 MPa and the mass flux is 600 kg/m².s. Calculate the pressure at the pipe exit and the flow regime at the inlet and exit assuming that the slip ratio is equal to (liquid density/vapor density)^(1/3)

Fig: 1