Lecture 12 Two Phase Properties

Lecture 12 Two Phase Properties - Thermal and Fluids...

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Thermal and Fluids Engineering I Prof. Deborah A. Kaminski Lecture 12 – Properties of Pure Substances Phase Diagrams Consider a process in which heat is added to a liquid contained in a piston-cylinder assembly at constant pressure: pressure in liquid is volume increases slightly constant – depth small (1” water = 0.036 psig) water about to boil liquid and vapor in equilibrium Lecture 12 Page 1
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Thermal and Fluids Engineering I Prof. Deborah A. Kaminski all liquid has just vapor temperature disappeared is rising Recall specific volume is volume 1 mass v ρ == Define f v – specific volume of saturated liquid (state 3) g v – specific volume of saturated vapor (state 5) Lecture 12 Page 2
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Thermal and Fluids Engineering I Prof. Deborah A. Kaminski What happens at higher pressure? 11 A vv > (liquid in state 1A is compressed) At what temperature will water boil at P = 200 kPa? T 3A > T 3 because pressure is holding the molecules together. They need more speed to escape into vapor. Lecture 12 Page 3
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Thermal and Fluids Engineering I Prof. Deborah A. Kaminski The complete isobar at 200 kPa is Other isobars (lines of constant pressure): Lecture 12 Page 4
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Thermal and Fluids Engineering I Prof. Deborah A. Kaminski The T-v plot to scale for steam: (from EES choose Plots Property Plots) 10 -3 -2 -1 0 1 2 3 0 100 200 300 400 500 600 700 v [m 3 /kg] T [°C] 4000 kPa 1600 kPa 400 kPa 100 kPa Steam We can also plot P versus v for lines of constant T Lecture 12 Page 5
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This note was uploaded on 04/06/2009 for the course ENGR 2250 taught by Professor Borca-tasciuc during the Spring '08 term at Rensselaer Polytechnic Institute.

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Lecture 12 Two Phase Properties - Thermal and Fluids...

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