Experimental and numerical investigation of a density-driven instability during a horizontal miscible displacement
We performed an experimental and numerical investigation of a convective buoyancy-driven instability that arises during the injection of a denser miscible fluid into a less dense one in a rectilinear geometry. We visualized the instability using a shadowgraph technique, and we obtained quantitative...
Elmentve itt :
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| Dokumentumtípus: | Cikk |
| Megjelent: |
2023
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| Sorozat: | PHYSICS OF FLUIDS
35 No. 6 |
| Tárgyszavak: | |
| doi: | 10.1063/5.0151757 |
| mtmt: | 34084569 |
| Online Access: | http://publicatio.bibl.u-szeged.hu/28028 |
| Tartalmi kivonat: | We performed an experimental and numerical investigation of a convective buoyancy-driven instability that arises during the injection of a denser miscible fluid into a less dense one in a rectilinear geometry. We visualized the instability using a shadowgraph technique, and we obtained quantitative information using micro-Particle Image Velocimetry. Numerical simulations provided further insights into the three-dimensional (3D) velocity field. We have shown that the instability only occurs above a certain Peclet number, Pe, depending on the Rayleigh, Ra, and Schmidt, Sc, numbers. We suggest scalings of the critical time, T-C, and dimensionless wavelength, ?/h, of the instability, both of which increase with increasing Pe and Ra. Finally, we investigated the interactions of the instability vortices with each other and the geometry boundaries. |
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| Terjedelem/Fizikai jellemzők: | 12 |
| ISSN: | 1070-6631 |