Steam enters a long, horizontal pipe with an inlet diameter of D1 12 cm at 1 MPa

Question:

Steam enters a long, horizontal pipe with an inlet diameter of D1 12 cm at 1 MPa and 300°C with a velocity of 2 m/s. Farther downstream, the conditions are 800 kPa and 250°C, and the diameter is D2 = 10 cm. Determine
(a) The mass flow rate of the steam and
(b) The rate of heat transfer.