Multicomponent Diffusivities from the Free Volume Theory

Final report on LDRD project: A phenomenological model for multicomponent transport with simultaneous electrochemical reactions in concentrated solutions

“…(4.15) the same reAccording to Wesselingh and Bollen (1997), Equation (4.14) applies when species 1 and 2 are similar chemically and of similar size; then the diffusion coefficients at the two limits don't differ significantly, and as noted by Rutten (1992) Equations (4.14) and (4. 15) yield similar results.…”

“…As pointed out in Kooijman and Taylor (1991) and Wesselingh and Bollen (1997) An alternative to Equation (4.16) for determining the Stefan-Maxwell diffusion coefficients in a multicomponent liquid mixture has recently been described (Wesselingh and Bollen, 1997) using free volume theory. A primary notion in the theory is that the mixture contains openings with volumes approximately equal to the molecular volume.…”

“…63-64 and p. 268, Krishna (1993), pp. 23-26, andBollen (1997). The binary diffusion coefficient @12in a binary liquid solution can be strongly concentration dependent and usually increases with temperature; typical binary diffusion coefficient variations with composition are 30~0 to more than 1009Io (Bird et al, 1960, p. 504).…”

“…where Rz is the radius of the solvent species; similarly when species 1 is the solvent and species 2 is the solute then the analogous formula (Wesselingh and Bollen, 1997) is:…”

Dynamic Interactions between Matrix and Fracture in Miscible Solvent Flooding of Fractured Reservoirs

“…The simulation was also performed for the case that diffusion is also implemented in the model. The diffusion coefficient for hexane-hexadecane system was obtained from Bidlack and Anderson (1964) and Wesselingh and Bollen (1997) and assumes a value of 0.866×10 -9 m 2 /s. The result is shown in Figure 19 as the dark dashed line.…”