Effect of anti-Langmuir adsorption on spreading in porous media

Rana, Chinar; Mishra, Manoranjan; Wit, A. De

doi:10.1209/0295-5075/124/64003

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…If the carrier fluid has a different viscosity than the sample solvent, VF can appear, which is dramatic for the efficiency of separation (Dickson et al (1997), Broyles et al (1998), De Wit et al (2005), Rousseaux et al (2007Rousseaux et al ( , 2011). In this context, it has been shown that adsorption on the porous matrix of components controling the viscosity of the fluids can influence the instability (Mishra et al (2007), Rana et al (2014Rana et al ( , 2018). As an example, the onset time of the instability can, in some cases, depend nonmonotonically on the retention parameter of the solute adsorption (Hota et al (2015)).…”

Section: Viscous Fingering In Reactive Systemsmentioning

confidence: 99%

Chemo-Hydrodynamic Patterns and Instabilities

Wit

2020

Annu. Rev. Fluid Mech.

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By modifying a physical property of a solution like its density or viscosity, chemical reactions can modify and even trigger convective flows. These flows in turn affect the spatiotemporal distribution of the chemical species. A nontrivial coupling between reactions and flows then occurs. We present simple model systems of this chemo-hydrodynamic coupling. In particular, we illustrate the possibility of chemical reactions controlling or triggering viscous fingering, Rayleigh–Taylor, double-diffusive, and convective dissolution instabilities. We discuss laboratory experiments performed to study these phenomena and compare the experimental results to theoretical predictions. In each case we contrast the chemo-hydrodynamic patterns and instabilities with those that develop in nonreactive systems and unify the different dynamics in terms of the common features of the related spatial mobility profiles.

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Section: Viscous Fingering In Reactive Systemsmentioning

confidence: 99%

Chemo-Hydrodynamic Patterns and Instabilities

Wit

2020

Annu. Rev. Fluid Mech.

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“…The peak profiles for L and AL displacements at time t ¼ 3 Â 10 4 are shown in the inset of Fig. 4(b) (Rana et al, 2019). It is seen that the L-AL alternation gives a smaller mixing length at a given time than both pure L or AL systems, thanks to this accordion effect.…”

Section: Accordion Effect and Reduction Of Peak Wideningmentioning

confidence: 92%

“…This isotherm is valid provided c m < c th ¼ 1=b AL where c th corresponds to the threshold concentration of the column. Because of the increased adsorption at larger c m , the velocity of the solute in the mobile phase is smaller in the zones of larger concentrations, which results in the formation of a SL at the rear interface and of a RF wave at the frontal interface (Lin et al, 1995;Rana et al, 2019). Anti-Langmuir isotherms feature therefore asymptotic triangular peaks with a SL at the back (see Fig.…”

Section: Anti-langmuir Isothermmentioning

confidence: 99%

Decreased peak tailing during transport of solutes in porous media with alternate adsorption properties

Rana

Malsche²,

Wit

2019

Chemical Engineering Science

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h i g h l i g h t s Spatial alternation of Langmuir and Anti-Langmuir adsorption zones reduces concentration overloading related band widening. Peak widening reduction is due to alternation of frontal and rear sharpening in the Langmuir and Anti-Langmuir zones. Efficiency of the Langmuir-Anti Langmuir alternation varies with details of the spatial adsorption geometry. A strategy to reduce peak broadening has been developed.

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“…In contrast, according to our statistical thermodynamic framework, Type III differs from Types I and II only by the sign of B ; deriving a separate isotherm model applicable only to Type III, such as the anti-Langmuir model, , has been made redundant. (Note that the anti-Langmuir model corresponds to B > 0 and C = 0.)…”

Section: Theorymentioning

confidence: 99%

Understanding Sorption Mechanisms Directly from Isotherms

Shimizu

Matubayasi

2023

Langmuir

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Currently, more than 100 isotherm models coexist for the six IUPAC isotherm types. However, no mechanistic insights can be reached when several models, each claiming a different mechanism, fit an experimental isotherm equally well. More frequently, popular isotherm models [such as the site-specific models like Langmuir, Brunauer–Emmett–Teller (BET), and Guggenheim–Anderson–de Boer (GAB)] have been applied to real and complex systems that break their basic assumptions. To overcome such conundrums, we establish a universal approach to model all isotherm types, attributing the difference to the sorbate–sorbate and sorbate–surface interactions in a systematic manner. We have generalized the language of the traditional sorption models (such as the monolayer capacity and the BET constant) to the model-free concepts of partitioning and association coefficients that can be applied across the isotherm types. Through such a generalization, the apparent contradictions, caused by applying the site-specific models alongside with cross-sectional area of sorbates for the purpose of surface area determination, can be eliminated straightforwardly.

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Effect of anti-Langmuir adsorption on spreading in porous media

Cited by 7 publications

References 28 publications

Chemo-Hydrodynamic Patterns and Instabilities

Chemo-Hydrodynamic Patterns and Instabilities

Decreased peak tailing during transport of solutes in porous media with alternate adsorption properties

Understanding Sorption Mechanisms Directly from Isotherms

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