Listar por autor "ebd30903d7ad39fe1508976c93bcae2d"
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Behaviour of a Ternary Mixture with the Net Separation Ratio Close to Zero
Shevtsova, Valentina (IOP Publishing, 2021)The behaviour of the ternary hydrocarbon mixture of toluene-methanol-cyclohexane in mass proportion 0.62/0.31/0.07 is studied. The direct numerical simulation is carried out for the two-dimensional closed cavity heated ... -
Binary Diffusion Coefficients for Short Chain Alcohols in Supercritical Carbon Dioxide-Experimental and Predictive Correlations
Shevtsova, Valentina (MDPI, 2023)Experimental binary diffusion coefficients for short-chain alcohols in supercritical carbon dioxide were measured using the Taylor dispersion technique in a temperature range of 306.15 K to 331.15 K and along the 10.5 MPa ... -
Diffusion in liquid mixtures
Bou-Ali, M. Mounir; Shevtsova, Valentina (Springer Nature, 2023)The understanding of transport and mixing in fluids in the presence and in the absence of external fields and reactions represents a challenging topic of strategic relevance for space exploration. Indeed, mixing and transport ... -
Diffusion of hydrocarbons diluted in supercritical carbon dioxide
Shevtsova, Valentina (Springer Nature, 2023)Mutual diffusion of six hydrocarbons (methane, ethane, isobutane, benzene, toluene or naphthalene) diluted in supercritical carbon dioxide ( CO2 ) is studied by molecular dynamics simulation near the Widom line, i.e., in ... -
Diffusion of Quinine with Ethanol as a Co-Solvent in Supercritical CO2
Shevtsova, Valentina (MDPI, 2020)This study aims at contributing to quinine extraction using supercritical CO2 and ethanol as a co-solvent. The diffusion coefficients of quinine in supercritical CO2 are measured using the Taylor dispersion technique when ... -
Effect of liner thermal properties and liner pre-cooling on the thermal management of fast-filling of hydrogen tanks
Blanco-Aguilera, Ricardo; Martinez Agirre, Manex; Berasategi Arostegi, Joanes; Penalba, Markel; Bou-Ali, M. Mounir; Shevtsova, Valentina (Elsevier, 2024)In transportation applications, filling high pressurised hydrogen tanks within a few minutes implies a fast and large temperature increase that can compromise the structural integrity of the storage system and the safety ... -
The effect of small perturbation on dynamics of absorptive LiBr–water solution
Fernandez de Arroiabe, Peru; Martinez Agirre, Manex; Bou-Ali, M. Mounir; Shevtsova, Valentina (AIP Publishing, 2024)In a binary solution of lithium bromide–water, even a small disturbance in the initial homogeneous mass fraction at the absorbing interface has profound effects on the entire system dynamics. This perturbation of absorption ... -
Enhancing PCM thermal management in multi-cycle melting-solidification
Bou-Ali, M. Mounir; Shevtsova, Valentina (Elsevier, 2024)We present a comprehensive study on heat transfer in phase-change materials (PCMs), focusing on both melting and solidification phases, different temperature scenarios, an assessment of practical implementation aspects, ... -
FTIR as a Powerful Tool for Measurements of Diffusion in Supercritical Carbon Dioxide Using Taylor Dispersion Method
Shevtsova, Valentina (MDPI, 2022)A new experimental high-pressure setup for measuring diffusion coefficients in supercritical fluids, based on Taylor dispersion method, and using an FTIR detector to operate up to 25.0 MPa was designed and optimized. Tracer ... -
Investigation of diffusive and optical properties of vapour-air mixtures: The benefits of interferometry
Shevtsova, Valentina (Elsevier Ltd., 2021)While interferometry has been widely used for diffusion measurements in liquid mixtures, it was hardly applied so far to vapour-gas mixtures. The present work aims to bridge this gap. Using an improved Mach–Zehnder ... -
The Measurement of Soret and Thermodiffusion Coefficients in Binary and Ternary Liquid Mixtures
Bou-Ali, M. Mounir; Shevtsova, Valentina (Springer Nature, 2023)This review provides an overview of the major, currently used techniques for investigating the Soret effect and measuring thermodiffusion and Soret coefficients, and in most cases also isothermal Fickian diffusion coefficients, ... -
Pattern selection for convective flow in a liquid bridge subjected to remote thermal action
Shevtsova, Valentina (AIP Publishing, 2022)The stability of thermocapillary/buoyant flows is affected by a remote thermal source. We present a nonlinear two-phase computational study of convection in a liquid bridge that develops under the action of Marangoni and ... -
Progress in multicomponent thermodiffusion studies in connection with the DCMIX space experiments
Shevtsova, Valentina; Bou-Ali, M. Mounir (AIP Publishing, 2024)Understanding of thermodiffusion in ternary mixtures has made significant progress during the course of the DCMIX (Diffusion and Thermodiffusion Coefficients in ternary mixtures) microgravity experiments onboard the ... -
The Soret coefficients of the ternary system water/ethanol/triethylene glycol and its corresponding binary mixtures
Bou-Ali, M. Mounir; Lapeira, Estela; Shevtsova, Valentina (Springer, 2021)Thermodiffusion in ternary mixtures is considered prototypic for the Soret effect of truly multicomponent systems. We discuss ground-based measurements of the Soret coefficient along the binary borders of the Gibbs triangle ... -
Thermodiffusion, diffusion and Soret coefficients of binary polymeric mixtures in toluene and cyclohexane
Sanjuan, Antton; Shevtsova, Valentina; Bou-Ali, M. Mounir (De Gruyter, 2024)We present the results of experimental study on measuring the thermodiffusion, molecular diffusion and Soret coefficients of polystyrene (4,880 g/mol) in the pure solvents toluene and cyclohexane at 298 K and atmospheric ... -
Three-dimensional effects during thermocapillary-driven melting of PCMs in cuboidal containers in microgravity
Bou-Ali, M. Mounir; Shevtsova, Valentina (Elsevier, 2024)The melting of a phase change material (PCM) in a cuboidal domain under microgravity conditions is investigated numerically. The upper surface of the PCM is free (in contact with air, for example) and variations in its ...