The effect of solute release position on transient solute dispersion in floating wetlands: An analytical study

Ai, Yidan; Dai, Hui-Chao; Zhai, Yan-Wei; Chen, Bin; Huai, Wenxin

doi:10.1016/j.jclepro.2022.133370

Cited by 8 publications

(3 citation statements)

References 39 publications

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“…The primary focus is to elucidate the consequences of point source solute injection on transport coefficients injected at various channel heights. The point-source effect has been discussed for macroscopic flows such as wetland flows and open-channel flows, [68][69][70][71] while the case of microchannel flows remains a need to investigate. To ascertain the mean concentration, we employ the third-order Gill series expansion technique with known values of transport coefficient obtained by the method of moment techniques, as shown in Sec.…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

Transient dispersion of reactive solute transport in electrokinetic microchannel flow

Huang,

Debnath,

Roy

et al. 2024

Physics of Fluids

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“…Liu et al [64] conducted random displacement model to numerically simulate the longitudinal dispersion coefficient in the channel with suspended canopies, and concluded that the suspended vegetation can increase Fickian time, that is, it will take longer time for the longitudinal dispersion coefficient to reach stability. Ai et al [65][66] investigated the dispersion process by analyzing the concentration cloud distortion, the temporal evolutions of dispersion intensity, and the displacement of the cloud centroid at the preasymptotic stage. Their study stated that the initial condition dominates the behavior of concentration cloud.…”

Section: Suspended Vegetationmentioning

confidence: 99%

“…Liu et al [64] , Ai et al [65,66] -Analyzing the dispersion process: Concentration cloud distortion, the temporal evolutions of dispersion intensity, and the displacement of the cloud centroid at the preasymptotic stage Compound channels with vegetated floodplains…”

Section: Suspended Vegetationmentioning

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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Sub-volume analysis of pore-network simulations: Determining the asymptotic longitudinal dispersion coefficient

Machado,

Lage,

Couto

2023

Advances in Water Resources

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The effect of solute release position on transient solute dispersion in floating wetlands: An analytical study

Cited by 8 publications

References 39 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

Sub-volume analysis of pore-network simulations: Determining the asymptotic longitudinal dispersion coefficient

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