Saturated water with a quality of 0.55 and a temperature of 120°C enters an uninsulated diffuser at a velocity of 180 m/s. The mass flow rate is 1.5 kg/s.
(a) If the water is to exit as saturated water vapor at a temperature of 120°C, with negligible velocity, determine the necessary heat transfer rate.
(b) Using your model of a diffuser, determine and plot the necessary heat transfer rates for the flow to exit as a saturated substance with qualities ranging from 0.65 to 1.0.
Given: Water: x1 =0.55; T1 = 120°C; V1 = 180 m/s; x2 = 1.0; T2 = 120°C; V2 = 0; m?=1.5 kg/s
What will be an ideal response?
For a diffuser, assume steady –state, steady-flow single-inlet, single-outlet flow, and assume that W?=?pe=0
These assumptions result in the first law being (State 1 is inlet, State 2 is outlet)
(Substantial heat transfer is necessary to complete boiling the water)
(b)
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