Study of chemoconvection by PIV at neutralization reaction under normal and modulated gravity

Mosheva, Elena; Kozlov, Nikolai

doi:10.1007/s00348-020-03097-0

Cited by 6 publications

(7 citation statements)

References 37 publications

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“…In this work, we present the results of the experimental study and theoretical analysis of the chemoconvection that arises during a frontal neutralisation reaction that proceeds in a HS cell that vibrates vertically at high frequency. The present paper is the continuation of our previous study, 16 where the experimental results, describing the effect of vertical vibrations on the structure and intensity of chemoconvection, together with a detailed description of the elaborated techniques were presented.…”

Section: Introductionmentioning

confidence: 82%

“…A more detailed description of the set-up and the subtlety of creation of the two-layer system can be found in a previous experimental paper. 16 We consider the neutralisation reaction that takes place between the aqueous solutions of strong acid HNO 3 and strong base KOH:…”

Section: Experimental Set-upmentioning

confidence: 99%

“…9 represent the chemical state of the studied systems at consecutive moments of time. They are calculated from experimental data using eqn (16). The latter is valid while the diffusion zone has not formed and the contact zone between the layers remains thin.…”

Section: Evolution Of the Reacting Systemmentioning

confidence: 99%

“…A more detailed description of the set-up and the subtlety of creation of the two-layer system can be found in a previous experimental paper. 16…”

Section: Experimental Set-upmentioning

confidence: 99%

“…The slowdown of chemoconvection in a similar setting but at high-frequency vibrations was found in experiments. 16 In a theoretical work 17 the action of vibrations on a two-layer reactive system filling some porous medium is considered. It is demonstrated that, depending on their frequency and amplitude, the vertical vibrations lead to either an increase in the reaction front stability, or its decrease.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Investigation of chemoconvection in vibration fields

Kozlov

Mosheva

2023

Phys. Chem. Chem. Phys.

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Section: Introductionmentioning

confidence: 82%

Section: Experimental Set-upmentioning

confidence: 99%

Section: Evolution Of the Reacting Systemmentioning

confidence: 99%

“…A more detailed description of the set-up and the subtlety of creation of the two-layer system can be found in a previous experimental paper. 16…”

Section: Experimental Set-upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation of chemoconvection in vibration fields

Kozlov

Mosheva

2023

Phys. Chem. Chem. Phys.

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Visualization of hydrodynamic and physico-chemical processes in rotating and vibrating containers

Kozlov

Mosheva

Shmyrov

2021

J. Phys.: Conf. Ser.

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Variable inertial fields are an efficient way to control the behaviour of hydrodynamic systems. Forces of inertia can be used, for example, to stabilize or destabilize systems with an interface or density gradient, to mix multiphase or non-isothermal fluids. The implementation of this approach means that liquids fill the periodically moving containers. In this paper, the situations are considered when the containers perform either rotation or translational vibrations. Methods for measuring the density and velocity fields of convective flows in reacting hydrodynamic systems are described. Interferometry is used to visualize the density distribution. Particle image velocimetry (PIV) is used to study the structure and velocity of the flows. Optical instruments are installed stationary in the laboratory system. For video recording, a camera shutter is synchronized with the motion of a container, and thus the images are captured in a fixed phase of oscillations or rotation. Constructions of the containers make it possible to illuminate the working volume through transparent walls at different angles or in different planes. They also provide a compensation for the centrifugal pressure and allow interference cells to be used in overload conditions. The successful application of the methods in experimental studies of chemo-hydrodynamic processes is demonstrated.

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Development of a neutralization reaction in a droplet that extracts chemically active surfactant from its homogeneous solution

Denisova,

Kostarev

2024

Preprint

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The development of the neutralization reaction in a stationary droplet of cylindrical shape, extracting a surfactant from the surrounding mixture in a vertical Hele-Shaw cell, was studied experimentally. In our experiment, we used a new method of the simultaneous visualization of the refractive index field of light and the distribution of acidity levels in the solutions of source reactants and reaction products within the droplet. To carry out this approach, we utilized a Fizeau interferometer and added a pH indicator to the droplet before the experiment. A digital video camera recorded the resulting interference pattern with the superimposed color distribution created by solutions with different acidity levels. The study was conducted on a system of liquids where the chemical potentials would be equal when the concentration of the extracted reactant in the droplet was much higher than in the surrounding environment. Two variants of reaction realization - with and without Marangoni convection development - were considered. We determined the structures of flows and concentration fields in the droplet and its neighborhood and traced their evolution. Also, we evaluated the characteristic times of the extraction process depending on the initial reactant concentrations and droplet sizes. It was found that the resulting Marangoni convection had an oscillatory character and continued after the reaction completion. As expected, the formation of the capillary motion intensified the development of chemical reaction inside the droplet.

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Study of chemoconvection by PIV at neutralization reaction under normal and modulated gravity

Cited by 6 publications

References 37 publications

Investigation of chemoconvection in vibration fields

Investigation of chemoconvection in vibration fields

Visualization of hydrodynamic and physico-chemical processes in rotating and vibrating containers

Development of a neutralization reaction in a droplet that extracts chemically active surfactant from its homogeneous solution

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