Tracer Dispersion due to Pulsatile Casson Fluid Flow in a Circular Tube with Chemical Reaction Modulated by Externally Applied Electromagnetic Fields

Murugan, D.; Roy, Ashis Kumar; Ponalagusamy, R.; Bég, O. Anwar

doi:10.1007/s40819-022-01412-3

Cited by 5 publications

(2 citation statements)

References 41 publications

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“…This has been observed in a number of other studies. 46,[48][49][50][51][52] A similar pattern is also computed in Fig. 6(d).…”

Section: A Transient Behavior Of Transport Coefficientsupporting

confidence: 78%

“…They noted that effective dispersion coefficient of a neutral solute band is considerably greater than for thicker polyelectrolyte layers (PELs), indicating that Taylor dispersion in electrokinetics is enhanced by attaching the PEL to the microchannel surface. Further studies of electro-Taylor dispersion in micro-conduits include the work by Roy et al 46 (who considered Casson viscoplastic fluids), Murugan et al 49 (who considered an axial electrical field and transverse magnetic field with boundary chemical reactions), Paul and Ng 50 (who included oscillatory electrical field and wall potential effects), Paul and Ng 51 (who included time-dependence), and Song et al 52 (who addressed kinetic sorptive exchange at the microchannel boundaries).…”

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

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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“…This has been observed in a number of other studies. 46,[48][49][50][51][52] A similar pattern is also computed in Fig. 6(d).…”

Section: A Transient Behavior Of Transport Coefficientsupporting

confidence: 78%

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

confidence: 99%

Transient dispersion of reactive solute transport in electrokinetic microchannel flow

Huang,

Debnath,

Roy

et al. 2024

Physics of Fluids

Self Cite

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Modeling non-Newtonian magnetized blood circulation with tri-nanoadditives in a charged artery

Karmakar

Das

2023

Journal of Computational Science

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Modulating solute transport in magnetohydrodynamic pulsatile electroosmotic micro-channel flow: Role of symmetric and asymmetric wall zeta potentials

Das,

Poddar,

Kairi

2024

Physics of Fluids

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This study provides a critical understanding of controlling solute distribution in microfluidic systems by examining the effects of symmetric and asymmetric zeta potentials under magnetohydrodynamic (MHD) pulsatile electroosmotic flow. These findings are vital for enhancing the efficiency of microfluidic devices used in lab-on-a-chip applications. The aim of this study is to explore the modulation of solute transport in MHD pulsatile electroosmotic microchannel flow, focusing on both symmetric and asymmetric wall zeta potentials. Using the Debye–Hückel approximation, the Poisson–Boltzmann equation is obtained. Subsequently, the convection–diffusion equation is solved using the velocity profile, with Aris's method of moments to derive the moment equations. These equations are then solved using a finite difference scheme. The mean concentration is calculated employing Hermite polynomials. We examined the effects of key parameters such as the electroosmotic parameter (κ), the Hartmann number (Ha), and zeta potentials on the dispersion coefficient (DT), mean concentration distribution (Cm), skewness, and kurtosis. We consider three situations: symmetric (ζ1=ζ2), partially asymmetric (ζ1=1.0,ζ2=0.0), and fully asymmetric (ζ1=1.0,ζ2=−1.0) zeta potentials. Our results reveal that asymmetric zeta potentials lead to faster dispersion, with DT decreasing with increasing κ for symmetric potentials and increasing for asymmetric ones. As the Hartmann number increases, dispersion decreases for both symmetric and asymmetric zeta potentials while the peak of mean concentration rises. The mean concentration profile exhibits Gaussian behavior at both small and large times, with anomalous behavior in the intermediate region. For symmetric zeta potentials, Gaussianity is observed at t = 0.001 in the diffusive regime and at t = 10.0 in Taylor's regime, while for asymmetric potentials, Gaussianity occurs at t = 0.03 and t = 3.0, indicating that large-time Gaussian behavior is approximately 3.33 times faster and dispersion becomes transient for asymmetric potentials.

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Tracer Dispersion due to Pulsatile Casson Fluid Flow in a Circular Tube with Chemical Reaction Modulated by Externally Applied Electromagnetic Fields

Cited by 5 publications

References 41 publications

Transient dispersion of reactive solute transport in electrokinetic microchannel flow

Transient dispersion of reactive solute transport in electrokinetic microchannel flow

Modeling non-Newtonian magnetized blood circulation with tri-nanoadditives in a charged artery

Modulating solute transport in magnetohydrodynamic pulsatile electroosmotic micro-channel flow: Role of symmetric and asymmetric wall zeta potentials

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