Thermoelectrokinetic instability and salt superconcentration near permselective electric membranes

Kalaydin, E. N.; Ganchenko, Nataly; Ganchenko, G. S.; Nikitin, N.; Demekhin, E. A.

doi:10.1103/physrevfluids.2.114201

Cited by 9 publications

(5 citation statements)

References 51 publications

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“…[4][5][6][7][8] This kind of instability was experimentally confirmed in the subsequent investigations. [9][10][11][12] A new type of instability, which prevails in long microchannels, was recently addressed in our works 13,14 and experimentally confirmed by other researchers. 15 It is connected with Joule heating effects in microscales and correspond to applications in thermal engineering.…”

Section: Introductionsupporting

confidence: 63%

Instability of a salt jet emitted from a point source in an external electric field

et al. 2022

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The objective in the present work is to consider a simple example of instability of a conducting self-similar micro jet in the external electric field, which represents a prototype of some microfluidic instabilities. Salt from a point source is emitted into its own aquatic solution, which is subject to an external uniform velocity field together with an electrostatic field, and is convected downstream and diffused. The flow is considered in microscales so that, in contrast to the classical jets, the Reynolds numbers are practically zero, but the Péclet numbers are large. The parameters are found at which such a microjet is unstable. Along with the linear stability analysis, we have fulfilled the numerical simulations of the full nonlinear system of equations. The numerical simulation qualitatively confirmed the results of the linear stability and showed that this instability visually reminds classical instabilities of free jets and wakes.

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Section: Introductionsupporting

confidence: 63%

Instability of a salt jet emitted from a point source in an external electric field

et al. 2022

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“…IV, Eqs. (16) and (17) indicate that in Fig. 4(b) we missed an intermediatetime voltage plateau 2% below the steady-state thermovoltage, and the slow L 2 /D + relaxation from one to the other.…”

Section: Unequal Ionic Diffusivitiesmentioning

confidence: 86%

“…For simplicity, we ignore all (salt) density dependence of these parameters. Moreover, we ignore convection here, which is reasonable if temperature differences are small and if the thermal gradient is aligned in the direction opposite to gravity [16]. Alternatively, convection can be minimized in "microgravity," e.g., onboard the International Space Station [17].…”

Section: Setupmentioning

confidence: 99%

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Transient response of an electrolyte to a thermal quench

Janssen

Bier

2019

Phys. Rev. E

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We study the transient response of an electrolytic cell subject to a small, suddenly applied temperature increase at one of its two bounding electrode surfaces. An inhomogeneous temperature profile then develops, causing, via the Soret effect, ionic rearrangements towards a state of polarized ionic charge density q and local salt density c. For the case of equal cationic and anionic diffusivities, we derive analytical approximations to q, c, and the thermovoltage VT for early (t τT ) and late (t τT ) times as compared to the relaxation time τT of the temperature. We challenge the conventional wisdom that the typically large Lewis number, the ratio a/D of thermal to ionic diffusivities, of most liquids implies a quickly reached steady-state temperature profile onto which ions relax slowly. Though true for the evolution of c, it turns out that q (and VT ) can respond much faster. Particularly when the cell is much bigger than the Debye length, a significant portion of the transient response of the cell falls in the t τT regime, for which our approximated q (corroborated by numerics) exhibits a density wave that has not been discussed before in this context. For electrolytes with unequal ionic diffusivities, VT exhibits a two-step relaxation process, in agreement with experimental data of Bonetti et al. [J. Chem. Phys. 142, 244708 (2015)].

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Thermodiffusion in Electrolyte Between Electric Membranes Under External Electric Field

Ganchenko

Repina

Ganchenko

et al. 2020

Microgravity Sci. Technol.

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Thermoelectrokinetic instability and salt superconcentration near permselective electric membranes

Cited by 9 publications

References 51 publications

Instability of a salt jet emitted from a point source in an external electric field

Instability of a salt jet emitted from a point source in an external electric field

Transient response of an electrolyte to a thermal quench

Thermodiffusion in Electrolyte Between Electric Membranes Under External Electric Field

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