Transport Property Predictions for CH4/H2/CO/CO2/N2/H2O Mixtures Based on Excluded Volume Without Fitting Parameters

Abstract

The knowledge of viscosity and thermal conductivity of molecular fluids in the dense phase, which could also accommodate mixture properties, are of great importance in chemical, aerospace, and syngas technology. In this study, we tend to offer a formulation that only needs “excluded volume” to calculate the transport properties for polyatomic fluids and fluid mixtures. The formulations allow calculation of transport properties over a wide range of temperature, pressure, and composition including the supercritical region. Based on the Chapman–Enskog equations, the low-density properties were taken to be corrected for the dense fluid region in which it has been proposed an excluded volume term whose value can be calculated using an equation of state, e.g., the Statistical Association Fluid Theory (SAFT) Equation of State (EoS). The models were tested for different mixtures comprising CH₄/H₂/CO/CO₂/N₂/H₂O molecules to calculate their transport properties over the entire fluid phase region. Furthermore, comparisons were made between the predicted values and existing experimental data or extended corresponding–states of law equation for mixtures.