On the modified Stefan–Maxwell equation for isothermal multicomponent gaseous diffusion

Runstedtler, Allan

doi:10.1016/j.ces.2006.03.040

Cited by 36 publications

(22 citation statements)

References 6 publications

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“…As already mentioned, the vector sum of the species diffusion fluxes J i is equal to zero (Runstedtler, 2006;Cunningham and Williams, 1980), thus only n − 1 of these equations are independent and Eq. (12) is required for a fully defined system.…”

Section: Multidimensional Smm Equationsmentioning

confidence: 95%

“…In concentrated gas and liquid mixtures, where species concentrations are of comparable magnitude, Fick's law (Krishna and Wesselingh, 1997;Runstedtler, 2006) cannot be used to describe mass transport effects, since it only accounts for one-way interactions between the solvent and the solutes. The SMM (Krishna and Wesselingh, 1997;Curtiss and Bird, 1999) on the other hand, takes into account all the species interactions in a mixture.…”

Section: The 1d Smm Equationsmentioning

confidence: 99%

“…Since the vector sum of the diffusion fluxes of all species J i is zero (Runstedtler, 2006;Cunningham and Williams, 1980), an additional equation is needed to fully define the system (Runstedtler, 2006;Taylor and Krishna, 1993):…”

Section: The 1d Smm Equationsmentioning

confidence: 99%

See 2 more Smart Citations

Modelling mass transport in solid oxide fuel cell anodes: a case for a multidimensional dusty gas-based model

Tseronis

Kookos

Theodoropoulos

2008

Chemical Engineering Science

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Section: Multidimensional Smm Equationsmentioning

confidence: 95%

Section: The 1d Smm Equationsmentioning

confidence: 99%

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Modelling mass transport in solid oxide fuel cell anodes: a case for a multidimensional dusty gas-based model

Tseronis

Kookos

Theodoropoulos

2008

Chemical Engineering Science

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“…If one assumes that the system of interest formed with a uniform distribution of species, one can use this initial composition, 0 , instead of the overall composition in Eqs. (9) and (11). In which case Eq.…”

Section: This Solution and Its Variants Including The Thermal Diffusimentioning

confidence: 99%

“…Baro-diffusion can be an important consideration when separating components from a mixture in a centrifuge [7], considering the impact of nitrogen diffusing into austentic stainless steel [8] and predicting the yield from thermonuclear devices [9]. Kocherginsky [10], amongst others, investigated the impact of pressure diffusion in membrane separation, whilst Runstedtler [11] has shown that baro-diffusion can have an important impact when predicting mass transfer in a solid oxide fuel cell.…”

Section: Introductionmentioning

confidence: 99%

Analytical solution for compositional profile driven by gravitational segregation and diffusion

2017

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An improved analytical solution is presented, based on irreversible thermodynamics, that describes the equilibrium distribution of the components of a non-ideal fluid mixture in an 1D, hydrostatic and isothermal system. In such a system, the vertical compositional profile of the fluid at equilibrium will be determined by the interaction of gravitational and chemical potentials. The new analytical solution estimates this profile from the overall composition of the fluid. It is thus more general than the existing solution which requires a knowledge of the fluid composition at a given depth and assumes that the vertical compositional profile of this fluid is already at equilibrium. The solution is demonstrated by comparison against results obtained from previously published molecular dynamics simulations of segregation in a binary mixture and against numerical simulations of a real hydrocarbon reservoir system.-1 -

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Detailed Multi‐dimensional Modeling of Direct Internal Reforming Solid Oxide Fuel Cells

et al. 2016

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Fuel flexibility is a significant advantage of solid oxide fuel cells (SOFCs) and can be attributed to their high operating temperature. Here we consider a direct internal reforming solid oxide fuel cell setup in which a separate fuel reformer is not required. We construct a multidimensional, detailed model of a planar solid oxide fuel cell, where mass transport in the fuel channel is modeled using the Stefan‐Maxwell model, whereas the mass transport within the porous electrodes is simulated using the Dusty‐Gas model. The resulting highly nonlinear model is built into COMSOL Multiphysics, a commercial computational fluid dynamics software, and is validated against experimental data from the literature. A number of parametric studies is performed to obtain insights on the direct internal reforming solid oxide fuel cell system behavior and efficiency, to aid the design procedure. It is shown that internal reforming results in temperature drop close to the inlet and that the direct internal reforming solid oxide fuel cell performance can be enhanced by increasing the operating temperature. It is also observed that decreases in the inlet temperature result in smoother temperature profiles and in the formation of reduced thermal gradients. Furthermore, the direct internal reforming solid oxide fuel cell performance was found to be affected by the thickness of the electrochemically‐active anode catalyst layer, although not always substantially, due to the counter‐balancing behavior of the activation and ohmic overpotentials.

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On the modified Stefan–Maxwell equation for isothermal multicomponent gaseous diffusion

Cited by 36 publications

References 6 publications

Modelling mass transport in solid oxide fuel cell anodes: a case for a multidimensional dusty gas-based model

Modelling mass transport in solid oxide fuel cell anodes: a case for a multidimensional dusty gas-based model

Analytical solution for compositional profile driven by gravitational segregation and diffusion

Detailed Multi‐dimensional Modeling of Direct Internal Reforming Solid Oxide Fuel Cells

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