Lecture 12 Two Phase Properties

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

This preview shows pages 1–6. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
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
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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## 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.

### Page1 / 14

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

This preview shows document pages 1 - 6. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online