Peculiarities of Combined Mixing Caused by Instability of Mechanical Equilibrium of Isothermal Ternary Gas Mixture at Diffusion
In this work, the transition from diffusive to convective mixing in an isothermal ternary gas system (helium–argon–nitrogen) in which the density of the mixture decreases with height is numerically investigated. The change of modes “isothermal diffusion–gravitational concentration convection” caused...
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| Format: | Article |
| Language: | English |
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Wiley
2025-01-01
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| Series: | International Journal of Chemical Engineering |
| Online Access: | http://dx.doi.org/10.1155/ijce/9643371 |
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| author | Vladimir N. Kossov Venera Mukamedenkyzy Arsen Tolepbergen Holm Altenbach |
| author_facet | Vladimir N. Kossov Venera Mukamedenkyzy Arsen Tolepbergen Holm Altenbach |
| author_sort | Vladimir N. Kossov |
| collection | DOAJ |
| description | In this work, the transition from diffusive to convective mixing in an isothermal ternary gas system (helium–argon–nitrogen) in which the density of the mixture decreases with height is numerically investigated. The change of modes “isothermal diffusion–gravitational concentration convection” caused by instability of mechanical equilibrium of the system was earlier investigated experimentally. A numerical study using “Species Transport Model” ANSYS Fluent modeled the mass transfer processes at different stages of diffusive and convective mixing. The approach demonstrated the presence of complex convective flow dynamics at small mixing times, which are difficult to realize in experiments. Reliability in reproducing quantitative values of concentrations during combined mixing for large relaxation times, which had been previously studied experimentally, was also noted. The presented results make it possible to analyze the mixing modes in multicomponent systems, which makes it possible to determine more correctly the regions of diffusion and convective perturbations. |
| format | Article |
| id | doaj-art-d4f84b66a6a14010a766abd754ef218a |
| institution | Kabale University |
| issn | 1687-8078 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Chemical Engineering |
| spelling | doaj-art-d4f84b66a6a14010a766abd754ef218a2025-08-20T03:40:45ZengWileyInternational Journal of Chemical Engineering1687-80782025-01-01202510.1155/ijce/9643371Peculiarities of Combined Mixing Caused by Instability of Mechanical Equilibrium of Isothermal Ternary Gas Mixture at DiffusionVladimir N. Kossov0Venera Mukamedenkyzy1Arsen Tolepbergen2Holm Altenbach3Abai Kazakh National Pedagogical UniversityAl-Farabi Kazakh National UniversityAl-Farabi Kazakh National UniversityOtto-von-Guericke-Universität MagdeburgIn this work, the transition from diffusive to convective mixing in an isothermal ternary gas system (helium–argon–nitrogen) in which the density of the mixture decreases with height is numerically investigated. The change of modes “isothermal diffusion–gravitational concentration convection” caused by instability of mechanical equilibrium of the system was earlier investigated experimentally. A numerical study using “Species Transport Model” ANSYS Fluent modeled the mass transfer processes at different stages of diffusive and convective mixing. The approach demonstrated the presence of complex convective flow dynamics at small mixing times, which are difficult to realize in experiments. Reliability in reproducing quantitative values of concentrations during combined mixing for large relaxation times, which had been previously studied experimentally, was also noted. The presented results make it possible to analyze the mixing modes in multicomponent systems, which makes it possible to determine more correctly the regions of diffusion and convective perturbations.http://dx.doi.org/10.1155/ijce/9643371 |
| spellingShingle | Vladimir N. Kossov Venera Mukamedenkyzy Arsen Tolepbergen Holm Altenbach Peculiarities of Combined Mixing Caused by Instability of Mechanical Equilibrium of Isothermal Ternary Gas Mixture at Diffusion International Journal of Chemical Engineering |
| title | Peculiarities of Combined Mixing Caused by Instability of Mechanical Equilibrium of Isothermal Ternary Gas Mixture at Diffusion |
| title_full | Peculiarities of Combined Mixing Caused by Instability of Mechanical Equilibrium of Isothermal Ternary Gas Mixture at Diffusion |
| title_fullStr | Peculiarities of Combined Mixing Caused by Instability of Mechanical Equilibrium of Isothermal Ternary Gas Mixture at Diffusion |
| title_full_unstemmed | Peculiarities of Combined Mixing Caused by Instability of Mechanical Equilibrium of Isothermal Ternary Gas Mixture at Diffusion |
| title_short | Peculiarities of Combined Mixing Caused by Instability of Mechanical Equilibrium of Isothermal Ternary Gas Mixture at Diffusion |
| title_sort | peculiarities of combined mixing caused by instability of mechanical equilibrium of isothermal ternary gas mixture at diffusion |
| url | http://dx.doi.org/10.1155/ijce/9643371 |
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