Analysis of contaminant dispersion in open channel with two streambank-absorption boundaries

Wang, Huilin; Ai, Yidan; Zhang, Jiao; Zhu, Zhengtao; Wang, Weijie; Jin, Yuhao; Huai, Wenxin

doi:10.1007/s11356-022-21999-w

Cited by 2 publications

(3 citation statements)

References 53 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

show abstract

“…As turbulence is the most common in natural flow fields, the instantaneous velocity changes tremendously, leading to the variation of scalar concentration. This indicates that solutes are dispersed over the whole width of the stream, with some solutes cloud moving fast as relative large velocity and other moving slower as slower velocity [25] . Therefore, the velocity of streams plays a vital role in controlling the diffusion of pollution and also scalar concentration.…”

Section: Introduction mentioning

confidence: 99%

Longitudinal dispersive coefficient in channels with aquatic vegetation: A review

Yang¹,

Fang²,

Yang³

et al. 2023

J Hydrodyn

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The determination of longitudinal dispersion coefficient in rivers is necessary for pollution control, environmental risk assessment, and management. In rivers with aquatic vegetation, the flow field is remarkably modified by canopies, which affects velocity profiles and dispersion characteristics dominated by the heterogeneity of the velocity field. The dispersion is deduced from lateral and vertical longitudinal velocity gradients for compound channels with vegetated floodplains and rectangular channels with river-wide vegetation, respectively. Although many efforts have been exerted to clarify the dispersion process in different conditions and predict the diffusion of contaminants in vegetated rivers, no studies have introduced it systematically. This study reviews the dispersion coefficient characteristics, including magnitude, main impacted factors, and relationships with flow and vegetation features, in channels with aquatic canopies considering the variation of impact factors changing with the different vegetation and river morphology scenarios. Several typical methodologies for determining longitudinal dispersion coefficients are also summarized to understand the dispersion processes and concepts. Apart from the pioneer outcomes of previous studies, the review also emphasizes the deficiency of existing studies and suggests possible future directions for improving the theory of dispersion in vegetated channels.

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Analysis of contaminant dispersion in open channel with two streambank-absorption boundaries

Cited by 2 publications

References 53 publications

Transient dispersion of reactive solute transport in electrokinetic microchannel flow

Transient dispersion of reactive solute transport in electrokinetic microchannel flow

Longitudinal dispersive coefficient in channels with aquatic vegetation: A review

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