Chapter 3 Properties Of Pure Substance 纯物质性质

Summary

基础概念

  • Liquid: compressed liquid 过冷水
  • gaz: super-heated gaz 过热气
  • phase change process 相变
  • Saturation temperature 温度保和
  • saturation pressure 饱合压力
  • Satured Liquide 饱合液体
  • Satured vaper 饱合气体
  • Critical point 三相点

quality 质量分数

\[ x=\frac{m_ \text { vopser }}{m _{to t a l}} \]

in the satured mixture region

\[ y = y_f+xy_g \]

理想气体

Ideal-gaz equation

  • \(PV = RT\)
  • constant of air: \(R = 8.314 kPa\cdot m^3/mol\cdot k = \ pour\ air \ = 0.287 kPa\cdot m^3/kg\cdot k\)

compressible factor 压缩系数

  • \(Z=\frac{P V}{R T}\)

reduced pressure, reduced temperature 折算压力/温度

\[ T_{R}={\frac{T}{T_{C r}} \quad P_{R}=\frac{P}{P_{C r}}} \]

  • 各种气体的性质又不相同,为了统一计算,这里引入折算压力(reduced pressure)折算温度(reduced temperature)
  • 其中\(P_{cr}\)\(T_{cr}\)分别代表临界压力和临界温度

范德华气体方程

\[ (P+\frac a{V^2})(V-b) = RT \]