205 - Direct Conversion of Chemical Energy Into Mechanical Energy at an Oil Water Interface

Dupeyrat, M.; Nakache, E.

doi:10.1016/0302-4598(87)87013-7

Cited by 170 publications

(100 citation statements)

References 11 publications

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“…Taking into account that the value for the change of the surface tension of water with the salt concentration S ϭ0.51 ϫ10 Ϫ3 N/͑m * mol/l) and other physical characteristics are QϭϪ5, 7ϫ10 4 J/mol, A 0 Ϸ0.1 mol/l, 1 ϭ0.6 W/͑m * K), D A1 ϭ10 Ϫ9 m 2 /s, 1 ϭ10 Ϫ3 Pa*s, hϳ10 Ϫ3 m, the solutal Marangoni number due to salt may be estimated as M S ϳϪ10 4 . For the thermal Marangoni number we obtain M ϳ10 4 . By comparing these values with those presented in Figs.…”

Section: Discussionmentioning

confidence: 99%

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On Marangoni convective patterns driven by an exothermic chemical reaction in two-layer systems

Bratsun

Wit

2004

Physics of Fluids

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This article is devoted to the investigation of Marangoni-driven pattern formation at the interface between two immiscible fluids filling a Hele-Shaw cell, each of them containing a reactant of an exothermic neutralization reaction. In such a system, convective patterns arise when one reactant diffuses through the interface to react with the other chemical species in one of the fluids. A chemo-hydrodynamical pattern appears due to Marangoni instabilities taking place because of heat and solutal driven changes of the surface tension. The mathematical model we develop consists in a set of reaction-diffusion-advection equations ruling the evolution of concentrations and temperature coupled to Navier-Stokes equation, written in a Hele-Shaw approximation. In our analysis, the time-dependent convectionless reaction-diffusion base state is first obtained and studied in detail. Next, we perform a linear stability analysis of this base state with regard to thermal and solutal Marangoni effects to determine the parameter values beyond which convection occurs. Finally, we perform numerical simulations of the fully nonlinear system and study the influence of the different parameters on pattern formation.

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Section: Discussionmentioning

confidence: 99%

“…In both cases the instability pattern starts from kϷ0. 4 and arises at about tϷ1. But as for other features, Figs.…”

Section: B Pure Thermal Instabilitymentioning

confidence: 99%

On Marangoni convective patterns driven by an exothermic chemical reaction in two-layer systems

Bratsun

Wit

2004

Physics of Fluids

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“…1 This characteristic movement of the liquid-liquid interface was autonomously repeated at an interface between an aqueous solution of a surfactant and a saturated nitrobenzene solution of potassium iodide. A droplet of the aqueous surfactant solution was observed to shrink and expand periodically when added to the nitrobenzene phase, and vice versa.…”

Section: Introductionmentioning

confidence: 97%

Spontaneous Oscillation Mechanism by Simultaneous Time-resolved Measurements of Interfacial Tensions of Both the Donor/Membrane and Membrane/Acceptor Phases

et al. 2014

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“…Especially, there have been much work on the oscillation in liquid/liquid interface or the liquid membrane systems. Following the pioneer work on the electrical instability at an oil/water interface by Dupeyrat and Nakache, 3,4 the oscillations of the interfacial potential difference or the interfacial tension in two-phase systems have been investigated. [5][6][7][8][9][10][11][12] Further, the oscillations of the membrane potential or the current in three-phase liquid membrane systems have been investigated extensively.…”

Section: Introductionmentioning

confidence: 99%

Propagation and Synchronization of Potential Oscillations in Multiple Liquid Membrane Systems

et al. 2012

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Two liquid membrane oscillators composed of aqueous solutions containing cetyltrimethylammonium chloride (CTACl) and alcohol, W1 and W1′, a nitrobenzene solution containing picric acid, O, and pure water phase, W2, were connected through O and W2 as common phases. Two glass tubes including W1 and W1′ were inserted into the O/W2 interface. Both membrane potential differences between W1 and W2 and that between W1′ and W2 were recorded using a pair of Ag/AgCl electrodes located near the orifice of each tube. The oscillations of two membrane potentials synchronized each other when the distance between the tubes was less than 10 mm. The synchronization was attended by the propagation of a potential pulse from one side to another with an interval of approximately 70 ms at a distance of 10 mm. It was examined whether the propagation of the potential pulse was due to electric conduction in bulk phases, or due to the interfacial conduction by several experiments in the addition of indifferent electrolytes or nonionic surfactant. Consequently, it has been demonstrated that the propagation of oscillation pulse was dominated mainly by the interfacial conduction process, and additionally by the bulk ionic conduction and that the interfacial diffusion and distribution of Cl -played a crucial role.

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205 - Direct Conversion of Chemical Energy Into Mechanical Energy at an Oil Water Interface

Cited by 170 publications

References 11 publications

On Marangoni convective patterns driven by an exothermic chemical reaction in two-layer systems

On Marangoni convective patterns driven by an exothermic chemical reaction in two-layer systems

Spontaneous Oscillation Mechanism by Simultaneous Time-resolved Measurements of Interfacial Tensions of Both the Donor/Membrane and Membrane/Acceptor Phases

Propagation and Synchronization of Potential Oscillations in Multiple Liquid Membrane Systems

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