Thermodynamic and transport properties of gases for use in solid oxide fuel cell modelling

Multicomponent diffusion is important in a variety of applications. In order to calculate diffusion flux, molecular diffusion coefficients are required, where fluid nonideality and the multicomponent nature of the mixture have a significant effect. A unified model for the calculation of diffusion coefficients of gas, liquid and supercritical states of nonpolar multicomponent mixtures is presented. A new correlation is proposed for the binary infinite dilution-diffusion coefficients. The generalized Vignes relation is used in multicomponent mixtures. Nonideality is rigorously described by the fugacity derivatives evaluated by the volume-translated Peng-Robinson equation of state. Predictions for highly nonideal gas and liquid multicomponent mixtures demonstrate the reliability of the proposed methodology. © 2007 American Institute of Chemical Engineers AIChE J, 2007

http://www.eng.yale.edu/aflab/archive/pdf/unified.pdf

Unified model for nonideal multicomponent molecular diffusion coefficients

. Diffusion of organic vapours to the surface of aerosol or cloud particles is an important step for the formation and transformation of atmospheric particles. So far, however, a database of gas phase diffusion coefficients for organic compounds of atmospheric interest has not been available. In this work we have compiled and evaluated gas phase diffusivities (pressure-independent diffusion coefficients) of organic compounds reported by previous experimental studies, and we compare the measurement data to estimates obtained with Fuller's semi-empirical method. The difference between measured and estimated diffusivities are mostly

/pdf/compilation-and-evaluation-of-gas-phase-diffusion-1bxyzztwbp.pdf

Compilation and evaluation of gas phase diffusion coefficients of reactive trace gases in the atmosphere: Volume 2. Diffusivities of organic compounds, pressure-normalised mean free paths, and average Knudsen numbers for gas uptake calculations

Morten Manner

Papers

Binary diffusion coefficients of low-density gases. I. Measurements by modified Loschmidt method

Binary diffusion coefficients of low-density gases. II. Molecular parameters and combining rules

Studies of the Loschmidt Diffusion Experiment. II. An Improved Interferometric Method