Gravitational stability analysis on double diffusion convection in ternary mixtures

Šeta, Berin; Errarte, Ane; Dubert, Diana; Gavaldà, Jna.; Bou-Ali, M. Mounir; Ruíz, Xavier

doi:10.1016/j.actaastro.2019.04.020

Cited by 13 publications

(4 citation statements)

References 18 publications

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“…Initial conditions consider constant fields of velocity, temperature and concentration. The validity of the model have been extensively verified with numeric and experimental results in both Cartesian and cylindrical cases respectively [34,35,42]. Similar solver and numerical schemes have been used in our previous work regarding g-jitters influence on ternary mixture [43,44].…”

Section: Numerical Modelmentioning

confidence: 78%

Stability analysis under thermogravitational effect

Šeta

Gavaldà

Bou-Ali

et al. 2020

International Journal of Thermal Sciences

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Section: Numerical Modelmentioning

confidence: 78%

Stability analysis under thermogravitational effect

Šeta

Gavaldà

Bou-Ali

et al. 2020

International Journal of Thermal Sciences

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“…In [55], the case is considered when two liquid layers with different concentrations are superimposed on each other. It is shown that instabilities during diffusion are possible in ternary mixtures, even if the density gradient is initially stable.…”

Section: Liquidsmentioning

confidence: 99%

Diffusion mechanisms of convective instability in liquid and gas mixtures

Kossov,

Altenbach

2023

Z Angew Math Mech

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A review of publications on stability of mechanical equilibrium of multicomponent mixtures in gases and liquids under non‐isothermal and isothermal conditions is given. Studies where diffusion in binary and multicomponent mixtures led to the occurrence of instability of mechanical equilibrium of the system have been analyzed. The main attention is paid to the description of approaches predicting the areas where there are increasing convective disturbances, as well as the determination of the spectrum of thermophysical parameters where the contribution of convection to heat and mass transfer is negligible. At the same time, the problems determining the role of diffusion, thermodiffusion, and double diffusion mechanisms in the separation of mixture components at the boundary of convective instability were given priority in the description. The results of investigations related to the study of the evolution of flows arising due to instability at the initial stage of mixing were also discussed.

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“…[27,28] It should be emphasized that the particle dispersion in a solvent can be colloidally stable (there is no change in the particle size) while it is gravitationally unstable (particles settle due to unmatched density with the solvent) but it should be highlighted that destabilization of the colloidal system usually leads to gravitational instability (larger particles start to settle down quickly). [29,30] Studying stabilization processes the indispensable concept is the adsorption process. On the basis of the adsorption measurements, the most probable stabilization mechanism can be deduced.…”

Section: Introductionmentioning

confidence: 99%

“…This process depends mainly on the physicochemical and rheological properties of the system [27,28] . It should be emphasized that the particle dispersion in a solvent can be colloidally stable (there is no change in the particle size) while it is gravitationally unstable (particles settle due to unmatched density with the solvent) but it should be highlighted that destabilization of the colloidal system usually leads to gravitational instability (larger particles start to settle down quickly) [29,30] …”

Section: Introductionmentioning

confidence: 99%

Colloidal and Thermal Stability of Three‐Component Hybrid Materials Containing Clay Mineral, Polysaccharide and Surfactant

Godek,

Maciołek,

Kosińska‐Pezda

et al. 2023

Chemistry A European J

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The paper presents the colloidal and thermal stability of the three‐component hybrid materials containing halloysite, polysaccharides (alginic acid, cationic cellulose and hydroxyethyl cellulose) and Tritons. TX‐100, TX‐165 and TX‐405 were used as non‐ionic surfactants. Stability and other properties of the hybrid materials were tested by the following methods: UV‐Vis, TGA (thermogravimetric analysis) and DSC (differential scanning calorimetry), CHN (elemental analysis), SEM‐EDX (scanning electron microscopy with energy dispersive X‐Ray spectroscopy) and tensiometry. According to the results with the increasing polymer concentration the colloidal stability of the tested systems also increases. Moreover, the addition of the surfactants causes the increase of polysaccharide adsorption but the colloidal stability of the tested systems decreases due to large weights of formed aggregates. As follows from the thermal analysis, the comparison of the TG/DTG‐DSC curves obtained for the investigated polymers confirms that their thermal decomposition courses have some common features. The obtained results have the application potential in the formation of the materials for the pollutants removal from water and sewages.

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Gravitational stability analysis on double diffusion convection in ternary mixtures

Cited by 13 publications

References 18 publications

Stability analysis under thermogravitational effect

Stability analysis under thermogravitational effect

Diffusion mechanisms of convective instability in liquid and gas mixtures

Colloidal and Thermal Stability of Three‐Component Hybrid Materials Containing Clay Mineral, Polysaccharide and Surfactant

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