Mixing rules for multicomponent mixture mass diffusion coefficients and thermal diffusion factors

Subgrid models for mass and thermal diffusion in turbulent mixing∗

Thermal Diffusion Factor in Gas Mixture-Dufour Effect (I)

The thermal diffusion factor, aT, for a binary gas mixture is calculated on the basis of nonequilibrium thermodynamics. A new formula for aT is derived and this factor is given for several paris of gases according to this formula.

Mass conservation and singular multicomponent diffusion algorithms

We investigate mass conservation in multicomponent diffusion algorithms. Usual diffusion matrices are indeed singular, i.e., noninvertible, because of mass conservation constraints. A consequence is that when all mass fractions are treated as independent unknowns-a widely used approach in complex chemistry reacting flow solvers-artificial singularities may appear in the governing equations. The...

On measurement of molecular and thermal diffusion coefficients in multicomponent mixtures.

We have developed the theory for using the deflection of laser beams of various wavelengths to determine molecular and thermal diffusion coefficients in multicomponent mixtures. In the past, simultaneous determination of molecular and thermal diffusion coefficients have only been achieved for binaries. Our procedure is faster and more accurate than the current techniques to determine molecular ...

Paper # 279c Molecular and Thermal Diffusion Coefficients of Binary Hydrocarbon Mixture

The Ludwig-Soret effect (that is, thermal diffusion) describes the concentration gradient in a mixture under a temperature gradient. The effect is quantified by the Soret coefficient, which is in turn related to the molecular and thermal diffusion coefficients of a mixture. Thermal diffusion is important in a myriad of applications, such as in petroleum reservoirs, material sciences, oceanograp...