Week 3: Thermodynamic Properties

Question 1

Simple Fluid

Answer 1

Simple fluids are idealized liquids and gases.

Question 2

Simple fluids behave as real fluids given that these three conditions are met:

Answer 2

1. No chemical reactions occur.
2. No electromagnetic effects are present.
3. The volume is large compared to the mean free path of the molecules making up the fluid (i.e. the distance molecules travel before they collide with each other).

Question 3

Six properties of simple fluids:

Answer 3

1. Temperature.
2. Pressure.
3. Specific Volume.
4. Specific Internal Energy.
5. Specific Enthalpy.
6. Specific Entropy.

Question 4

Two Property Rule

Answer 4

This states that for equilibrium states of a closed system containing a simple fluid, if two properties are known and fixed, then the others will have unique values and can be evaluated.

Question 5

The two property rule can be used two ways:

Answer 5

1. Evaluated using equations of state.
2. Evaluated using the Thermodynamic Properties Table.

Question 6

How do you solve thermodynamic properties in single phase systems?

Answer 6

1. Using the Thermodynamic Properties Tables.
2. Using linear interpolation.

Question 7

How do you solve thermodynamic properties in two phase systems?

Answer 7

1. Using the dryness factor.