On the miscible thermo-viscous fingering instability of non-Newtonian fluids in heterogeneous porous media
| Autor: | Mahmood Norouzi, H. Shokri, Mohammad Hassan Kayhani |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Materials science
010304 chemical physics technology industry and agriculture Mechanics Viscous liquid equipment and supplies Condensed Matter Physics 01 natural sciences Instability Lewis number Non-Newtonian fluid 010305 fluids & plasmas Physics::Fluid Dynamics Viscous fingering 0103 physical sciences Newtonian fluid natural sciences General Materials Science Porous medium Displacement (fluid) |
| Zdroj: | Rheologica Acta. 58:755-769 |
| ISSN: | 1435-1528 0035-4511 |
| DOI: | 10.1007/s00397-019-01176-6 |
| Popis: | In this paper, the thermo-viscous fingering instability in the displacement of Newtonian fluid by a shear-thinning non-Newtonian fluid in the heterogeneous porous media is studied. Here, the heterogeneity of medium is assumed to be layered. Two different types of displacements are considered: a cold low viscous fluid displaces a hot high viscous one and vice versa. The numerical solution is obtained using a spectral method based on Hartley transforms and fourth-order Adams–Bashforth technique. By interoperation of concentration and temperature contours, transversely averaged profiles, mixing length, and sweep efficiency, it is shown that heterogeneity of porous media has a significant effect on the thermo-viscous fingering instability. The decreasing thermal-lag coefficient leads to more unstable flow and Lewis number has different effects on displacements. When a cold less viscous fluid is displacing fluid, this parameter has destabilizing effect while for displacing hot more viscous fluid, and it acts in favor of stability. |
| Databáze: | OpenAIRE |
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