getMixtureLambda

Chemical Reactor Design Toolbox Reference Manual

ChemReactorDesign.Basic.Gas.Functions.getMixtureLambda

The heat conductivity of the gas mixture is calculated according to the Wassiljevailke equation (Robert C. Reid and John M. Prausnitz and Thomas K. Sherwood, 1977).

$\begin{equation*} {\overline \lambda} = \sum_{i}^{N} \frac{x_{i} \, \lambda_{i}} {\sum\limits_{j}^{N} x_{i} \, \Phi_{ij}} \end{equation*}$

mit

$\begin{equation*} \Phi_{ij} = \frac{\left[ 1 + \sqrt{\frac{\mu_{i}}{\mu_{j}}} \, \left( \frac{M_{i}}{M_{j}}\right)^{1/4} \right]^{2}} {\sqrt{8 \, \left(1 + \frac{M_{i}}{M_{j}} \right)}} \end{equation*}$

Nomenclature

$M_{i}$	molar mass of species A_i
$\mu_{i}$	viscosity of species A_i
$\lambda_i$	heat conductivity of species A_i
$x_{i}$	mole fraction of species A_i

Bibliography

Robert C. Reid and John M. Prausnitz and Thomas K. Sherwood (1977). The Properties of Gases and Liquids, Mc Graw-Hill Book Company.