Magnetic-field-driven alteration in capillary filling dynamics in a narrow fluidic channel

Gorthi, Srinivas R.; Mondal, Pranab Kumar; Biswas, Gautam

doi:10.1103/physreve.96.013113

Cited by 19 publications

(13 citation statements)

References 39 publications

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“…This results in modification in the filling as well as the wetting phenomena in the processes while eliminating the need for intrusive or mechanical means control of flow through microchannels. [ 19,20 ] It is worth mentioning here that the contact line under the influences of different forces encounters stick‐slip motion, leading to a controlled movement of the interface in the process as reported in the aforementioned literature. As such, the stick‐slip (which is also known as a [de]pinning phenomenon) provides better control over the filling/wetting processes.…”

Section: Introductionmentioning

confidence: 90%

“…The present work investigates the combined influence of an axial electric field and a transverse magnetic field on the capillary transport dynamics of an immiscible binary system. To isolate the influence of the applied electric and magnetic fields, unlike Gorthi et al, [ 19 ] we consider two initially stagnant immiscible fluids in a narrow channel without any imposed pressure gradient and investigate the interfacial fingering patterns resulting only due to the applied electric and magnetic fields. The dynamics is due to the interfacial forces actuated by the Lorentz force and modulated by the electrokinetic influence.…”

Section: Introductionmentioning

confidence: 99%

“…As such, the Lorentz force results in a restricted movement of the interface in the process, thus offering a greater degree of manoeuvrability over controlling the flow dynamics in microfluidic channels. [24][25][26] Recently, Gorthi et al [19] studied the influence of the magnetic field on the capillary filling dynamics of a pressure-driven flow in a narrow channel, without taking the effect of the axial electric field into consideration.…”

Section: Introductionmentioning

confidence: 99%

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Electro‐capillary filling in a microchannel under the influence of magnetic and electric fields

et al. 2020

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We numerically investigate the dynamics of two immiscible conductive fluids in a narrow fluidic channel under the combined influence of electric and magnetic fields using a diffuse interface based phase-field model. The numerical solver is validated from two different perspectives, viz., with the reported results of microscale multiphase transport as well as the available experimental results in the paradigm of electrically actuated transport. The magnetic field induces the Lorentz force due to its interaction with the electrical forcing, which in turn leads to complex interfacial dynamics and development of a finger-like interface front of the advancing fluid into the receding fluid. Under certain conditions studied in the present work, the trend reverses, and a finger of receding fluid is formed into the advancing fluid. The effect of contrast in fluid properties is studied and the interface breaking phenomenon is observed beyond a threshold viscosity contrast. It is found that for a given viscosity contrast between the fluids, an increase in the strength of the applied magnetic field prevents wetting failure.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Electro‐capillary filling in a microchannel under the influence of magnetic and electric fields

et al. 2020

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“…It may be mentioned here that owing to the low Reynolds number (Re << 1), the nonlinear convective effects are often neglected while analyzing the dynamical behavior of underlying transport in narrow fluidic pathways having different geometrical configurations [22][23][24]. Although the convective terms are conveniently discarded in the momentum transport equations in describing microflows, additional effects like the electric field, magnetic field, etc., are commonly taken into account to obtain augmented fluidic functionalities at the microfluidic scales [23,[25][26][27][28][29][30][31][32][33][34]. The inclusion of these additional effects makes the transport equations analytically intractable to essentially to obtain the desired solutions.…”

Section: Introductionmentioning

confidence: 99%

Spreadsheet analysis of the field‐driven start‐up flow in a microfluidic channel

Mondal

Roy

2021

Electrophoresis

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We discuss, in this article, the solution method of the unsteady electroosmotic flow of Newtonian fluid in a square microfluidic channel cross-section in the framework of spreadsheet analysis. We demonstrate the implementation of the finite difference scheme, which is used for the discretization of the transport equations governing the flow dynamics of the present problem, in the spreadsheet tool. Also, we have shown the implementation details of different boundary conditions, which are typically used for the underlying electrohydrodynamics in a microfluidic channel, in the spreadsheet analysis tool. We show that the results obtained from the spreadsheet analysis match accurately with the numerical solutions for both the electrostatic potential distribution and the flow velocity. Our results of this analysis justify the credibility of the spreadsheet tool for capturing the intricate details of the electrically actuated microflows during the initial transiences, that is, for the startup flows and the phenomenon due to the electrical double layer effect, quite effectively. The inferences of this analysis will open up a new research paradigm of microfluidics and microscale transport processes by providing the potential applicability of the spreadsheet tools to obtain the flow physics of our interest in a very intuitive and less expensive manner.

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“…Several attempts toward the alteration in the interfacial dynamics of the contact line motion have been addressed by researchers in the recent past [12,18,19]. Such avenues essentially control the spatio-temporal movement of the liquid front in the capillary [19,20].…”

Section: Introductionmentioning

confidence: 99%

Capillary imbibition of non-Newtonian fluids in a microfluidic channel: analysis and experiments

et al. 2020

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We have presented an experimental analysis on the investigations of capillary filling dynamics of inelastic non-Newtonian fluids in the regime of surface tension dominated flows. We use the Ostwald–de Waele power-law model to describe the rheology of the non-Newtonian fluids. Our analysis primarily focuses on the experimental observations and revisits the theoretical understanding of the capillary dynamics from the perspective of filling kinematics at the interfacial scale. Notably, theoretical predictions of the filling length into the capillary largely endorse our experimental results. We study the effects of the shear-thinning nature of the fluid on the underlying filling phenomenon in the capillary-driven regime through a quantitative analysis. We further show that the dynamics of contact line motion in this regime plays an essential role in advancing the fluid front in the capillary. Our experimental results on the filling in a horizontal capillary re-establish the applicability of the Washburn analysis in predicting the filling characteristics of non-Newtonian fluids in a vertical capillary during early stage of filling (Digilov 2008 Langmuir 24 , 13 663–13 667 ( doi:10.1021/la801807j )). Finally, through a scaling analysis, we suggest that the late stage of filling by the shear-thinning fluids closely follows the variation x ~ t . Such a regime can be called the modified Washburn regime (Washburn 1921 Phys. Rev. 17 , 273–283 ( doi:10.1103/PhysRev.17.273 )).

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Magnetic-field-driven alteration in capillary filling dynamics in a narrow fluidic channel

Cited by 19 publications

References 39 publications

Electro‐capillary filling in a microchannel under the influence of magnetic and electric fields

Electro‐capillary filling in a microchannel under the influence of magnetic and electric fields

Spreadsheet analysis of the field‐driven start‐up flow in a microfluidic channel

Capillary imbibition of non-Newtonian fluids in a microfluidic channel: analysis and experiments

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