Effects of bulk degradation and boundary absorption on dispersion of contaminant in wetland flow

Poddar, Nanda; Dhar, Subham; Mazumder, B. S.; Kairi, Rishi Raj; Mondal, Kajal Kumar

doi:10.1016/j.ijheatmasstransfer.2021.121669

Cited by 20 publications

(4 citation statements)

References 32 publications

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“…The crucial differences are: (i) this study considers absorption at both the microchannel walls, and the reaction coefficients can be different from each other. Only a few previous studies [53][54][55][56] investigated this effect, and they all focused on macroscopic flows such as wetland flows. (ii) The wall potentials at the microchannel walls can be different such that the electro-osmotic flow can be asymmetric with respect to the centerline of the microchannel.…”

Section: Transient Dispersion Of Reactive Solute Transport In Electro...mentioning

confidence: 99%

“…The transport problem with absorption at both walls has been investigated by some studies. [53][54][55][56] However, they have applied the multi-timescale homogenization technique, and, thus, the eigenvalue problem with absorption at both walls is not available in these papers. Fortunately, this kind of eigenvalue problem has been discussed in the textbook by Polyanin,78 [p. 283] and, thus, we can directly use the solutions therein.…”

Section: Author Declarations Conflict Of Interestmentioning

confidence: 99%

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Transient dispersion of reactive solute transport in electrokinetic microchannel flow

Huang,

Debnath,

Roy

et al. 2024

Physics of Fluids

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Motivated by emerging applications in bio-microfluidic devices, the present study rigorously examines the generalized Taylor–Gill hydrodynamic dispersion of a point source solute injected into a microchannel, influenced by a constant axial static electric field along the channel and charged surface with different wall potentials. The solute engages in a first-order irreversible chemical reaction at both the microchannel walls. By incorporating different wall potentials and absorptive coefficients at the lower and upper walls, the current transport model for electro-osmotic flows is extended to encompass a wider range of applications. The solute transport phenomenon is intricately modeled using the unsteady convective diffusion equation. Employing Gill's generalized dispersion model, a concentration decomposition technique, up to the third-order accuracy, we meticulously analyze the transport process. Furthermore, a comprehensive comparison between analytical outcomes and numerical simulations using the Brownian Dynamics method is undertaken, enhancing the robustness of the analytical approach. The scattering process is mainly analyzed with the help of exchange, convection, dispersion, and asymmetry coefficients, along with the mean concentration profile. The effect of initial solute release at various vertical locations in the microchannel is shown to exert a considerable impact on all the transport coefficients at initial times.

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Section: Transient Dispersion Of Reactive Solute Transport In Electro...mentioning

confidence: 99%

Section: Author Declarations Conflict Of Interestmentioning

confidence: 99%

Transient dispersion of reactive solute transport in electrokinetic microchannel flow

Huang,

Debnath,

Roy

et al. 2024

Physics of Fluids

View full text Add to dashboard Cite

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“…Moreover, Barik and Dalal (2018) applied the multi-scale homogenization approach to a channel flow with bed absorption for providing longitudinal and transverse distribution of mean concentration. Recently, the effect of ecological elements on contaminant transport in wetland flows with bed absorption showed the significant influence on contaminant transport that reduced the mass and transport speed (Poddar et al, 2021;Wang et al, 2020). Indeed, Wang et al (2020) performed an analytical study to describe the physical mechanisms for solute transport due to the effect of surface wind and the consequence of bottom wall absorption on wetland flows and validated their results with numerical simulation.…”

Section: Introductionmentioning

confidence: 97%

“…Solute dispersions in free surface wetland flows have significant attention due to the velocity distributions and mass transports in wetlands with emergent hydrophytes plants (Chen, 2013;Lightbody & Nepf, 2006a;Nepf, 2012;Nepf & Ghisalberti, 2008). Some experimental and analytical investigations were performed to reveal the nature of homogeneous solutes and suspended sediments concerning environmental dispersion in wetland flows (Chen et al, 2010;Dhar et al, 2021;Poddar et al, 2021;White & Nepf, 2008;Wu et al, 2015;. Murphy et al (2007) and White and Nepf (2008) presented an experimental study to predict the model based velocity distribution for the partially submerged vegetation in shallow channel, exploring different scales of turbulence.…”

Section: Introductionmentioning

confidence: 99%

Multi‐scale analysis for environmental dispersion in wetland flow under the effect of wind

2022

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The present study emphasizes a multi‐scale analysis of an environmental dispersionin a fully developed shallow wetland flow under the wind effect, based on the momentum and mass transfer equations. From the classical momentum equation, the depth‐dominated velocity profile is derived for the wetland flow. The environmental dispersion is examined using Mei's multi‐scale analysis on moment equations of concentration in wetlands with wind‐induced effect. Further, the maximum velocity, thickness of separation layer with recirculation and its position are obtained. The increase of depth‐averaged velocity was observed for the larger contribution of conveyance capacity in wetland flows for the enhancement of wind direction. Also, the analytical result showed that the higher magnitude of environmental dispersion led to intensive dispersion process for the depth‐dominated wetland flow. Moreover, for the hierarchical composition of contaminant constituents, the duration and length of influenced region are associated with a certain standard water quality level in wetland.

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Numerical Exploration of Tracer Behavior in Porous Channels with Couple Stress and Magnetic Fields

Dhar,

Kumar Mondal,

Mohan Chadha

2024

Springer Proceedings in Physics

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Effects of bulk degradation and boundary absorption on dispersion of contaminant in wetland flow

Cited by 20 publications

References 32 publications

Transient dispersion of reactive solute transport in electrokinetic microchannel flow

Transient dispersion of reactive solute transport in electrokinetic microchannel flow

Multi‐scale analysis for environmental dispersion in wetland flow under the effect of wind

Numerical Exploration of Tracer Behavior in Porous Channels with Couple Stress and Magnetic Fields

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