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12.01 - The van der Waals Perspective for Mixtures
Book navigation
- Chapter 1 - Basic concepts
- Chapter 2 - The energy balance
- Chapter 3 - Energy balances for composite systems.
- Chapter 4 - Entropy
- Chapter 5 - Thermodynamics of Processes
- Chapter 6 - Classical Thermodynamics - Generalization to any Fluid
- Chapter 7 - Engineering Equations of State for PVT Properties
- Chapter 8 - Departure functions
- Chapter 9 - Phase Equlibrium in a Pure Fluid
- Chapter 10 - Introduction to Multicomponent Systems
- Chapter 11 - An Introduction to Activity Models
- Chapter 12 - Van der Waals Activity Models
- Chapter 13 - Local Composition Activity Models
- Chapter 14 - Liquid-liquid and solid-liquid equilibria
- Chapter 16 - Advanced Phase Diagrams
- Chapter 15 - Phase Equilibria in Mixtures by an Equation of State
- Chapter 17 - Reaction Equilibria
- Chapter 18 - Electrolyte Solutions
Mixing Rules (7:23)
Mixing Rules (7:23) (msu.edu)
How should energy depend on composition? Should it be linear or non-linear? What does the van der Waals approach tell us about composition dependence? This screencasts shows that the mixing rule for 'a' in a random mixture should be quadratic. A linear mixing rule is usually used for the van der Waals size parameter.
Configurational Energy:Molecular Basis of Quadratic Mixing Rules
Configurational Energy and Quadratic Mixing Rules (uakron, 15min) van der Waals mixing rules can also be derived by counting the molecular energies, like we did in Section 1.2 and referring to the configurational energy departure function from Chapter 7. This approach lays the foundation for non-quadratic mixtures too, as discussed in Section 13.7. In this way, the concepts of Chapter 1 are connected to the model equations applied throughout the text.