Simultaneous Correlation of Saturated Viscosities of Pure Gases and Liquids Using the Significant Structure Theory
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- 作者：Gustavo Cruz-Reyes ; Gabriel Luna-Bá ; rcenas ; J. Francisco Javier Alvarado ; Isaac C. Sá ; nchez ; and Ricardo Mací ; as-Salinas
- 刊名：Industrial & Engineering Chemistry Research
- 出版年：2005
- 出版时间：March 16, 2005
- 年：2005
- 卷：44
- 期：6
- 页码：1960 - 1966
- 全文大小：129K
- 年卷期：v.44,no.6(March 16, 2005)
- ISSN：1520-5045
文摘
The significant structure theory (SST) for liquid viscosities, originally proposed by Eyring, coupledwith a cubic equation of state was used for the simultaneous correlation of gas and liquidviscosities of pure fluids (polar and nonpolar) at saturated conditions. The SST visualizes aliquid as having both "solidlike" and "gaslike" degrees of freedom with "fluidized vacancies" ofmolecular size randomly distributed throughout a quasi-lattice structure. In this context, theviscosity of a liquid is calculated from two main components: a gaslike 
g and a solidlike scontribution. The first viscosity contribution g represents the viscosity of a pure fluid at dilutegas conditions (low-pressure viscosity). The method of Chung et al. based on the Chapman-Enskog kinetic theory of gases was used to calculate g. The second contribution s captures thesolidlike effects on viscosity. This quantity was calculated by means of Eyring's absolute ratetheory. All the thermodynamic properties required in the viscosity model were computed viathe use of a well-known cubic equation of state (Soave-Redlich-Kwong or Peng-Robinson)thus allowing the simultaneous correlation of gas-liquid viscosities along their coexistence curve.The resulting model was satisfactorily validated in the representation of experimental saturatedgas and liquid viscosities of a highly polar compound (water) and a nonpolar fluid (propane)over a wide range of temperatures (from near the triple point up to the critical region of thefluid of interest).
g and a solidlike scontribution. The first viscosity contribution g represents the viscosity of a pure fluid at dilutegas conditions (low-pressure viscosity). The method of Chung et al. based on the Chapman-Enskog kinetic theory of gases was used to calculate g. The second contribution s captures thesolidlike effects on viscosity. This quantity was calculated by means of Eyring's absolute ratetheory. All the thermodynamic properties required in the viscosity model were computed viathe use of a well-known cubic equation of state (Soave-Redlich-Kwong or Peng-Robinson)thus allowing the simultaneous correlation of gas-liquid viscosities along their coexistence curve.The resulting model was satisfactorily validated in the representation of experimental saturatedgas and liquid viscosities of a highly polar compound (water) and a nonpolar fluid (propane)over a wide range of temperatures (from near the triple point up to the critical region of thefluid of interest).