Browsing by Author "ebd30903d7ad39fe1508976c93bcae2d"
Now showing items 1-20 of 25
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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 ... -
Benchmark values for the Soret, thermodiffusion and molecular diffusion coefficients of the ternary mixture tetralin+isobutylbenzene+n-dodecane with 0.8-0.1-0.1 mass fraction
Bou-Ali, M. Mounir; Ahadi, A.; Alonso de Mezquia, David; Galand, Q.; Gebhardt, M.; Khlybov, O.; Köhler, W.; Larrañaga, Miren; Legros, J. C.; Lyubimova, T.; Mialdun, Aliaksandr; Ryzhkov, I.; Saghir, M. Z.; Shevtsova, Valentina; Van Vaerenbergh, S. (Springer Nature, 2015)With the aim of providing reliable benchmark values, we have measured the Soret, thermodiffusion and molecular diffusion coefficients for the ternary mixture formed by 1,2,3,4-tetrahydronaphthalene, isobutylbenzene and ... -
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 ... -
A comprehensive study of diffusion, thermodiffusion, and Soret coefficients of water-isopropanol mixtures
Mialdun, Aliaksandr; Yasnou, V.; Shevtsova, Valentina; Königer, A.; Kohler, W.; Alonso de Mezquia, David; Bou-Ali, M. Mounir (AIP Publishing, 2012)We report on the measurement of diffusion (D), thermodiffusion (DT), and Soret (ST) coefficients in water-isopropanol mixtures by three different instrumental techniques: thermogravitational column in combination with ... -
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 ... -
Effect of the supporting disks shape on nonlinear flow dynamics in a liquid bridge
Gaponenko, Yuri; Yasnou, V.; Mialdun, Aliaksandr; Nepomnyashchy, Alexander; Shevtsova, Valentina (AIP Publishing, 2021)The stability of convective flows in a non-homogeneous temperature field is affected by the shape of the container hosting the fluid. We present a nonlinear two-phase computational study of convection in a liquid bridge ... -
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 ... -
Influence of gravity on dynamics of absorbing binary mixture
Fernandez de Arroiabe, Peru; Martinez Agirre, Manex; Bou-Ali, M. Mounir; Shevtsova, Valentina (Elsevier, 2025)A small perturbation in the absorption process disrupts the equilibrium, leading to surface tension gradients and, subsequently, Marangoni flows. This study examines the comparative role of gravity in the evolution of ... -
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 ... -
Marangoni-driven pattern formation in an absorbing binary mixture
Fernandez de Arroiabe, Peru; Martinez Agirre, Manex; Nepomnyashchy, Alexander; Bou-Ali, M. Mounir; Shevtsova, Valentina (American Institute of Physics, 2024-10-21)We investigate the evolution of convective instability in a LiBr-water binary mixture, driven by thermal and solutal Marangoni stresses, through numerical simulations. A small perturbation in absorption at the surface ... -
Mass transport in LiBr–H2O solutions: Coupling between diffusion, thermodiffusion, and composition
Perez de Luco, Irene; Errarte, Ane; Fernandez de Arroiabe, Peru; Mialdun, Aliaksandr; Mojtabi, A.; Costeseque, P.; Shevtsova, Valentina; Bou-Ali, M. Mounir (AIP, 2025)We present an experimental investigation of mass transport phenomena in aqueous lithium bromide (LiBr–H2O) solutions, focusing on both molecular diffusion and thermodiffusion (Soret effect). Our results show a non-monotonic ... -
Measurement of optical properties of aqueous lithium bromide solutions with and without surfactant for potential use in interferometric analysis of absorption systems
Perez de Luco, Irene; Mialdun, Aliaksandr; Fernandez de Arroiabe, Peru; Errarte, Ane; Shevtsova, Valentina; Bou-Ali, M. Mounir (ACS, 2025)The refractive indices of aqueous lithium bromide (LiBr–H2O) solutions were measured over a wide range of mass fractions, from 0 to 0.62 kg/kg (62%), at seven wavelengths between 436.1 and 655 nm. Measurements were conducted ... -
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 ...
