Numerical study of the effect of blockage ratio on the flow past one and two cylinders in tandem for different power-law fluids
| Autor: | Marcela Cruchaga, A. Aguirre, Ernesto Castillo, O. Ruz |
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| Rok vydání: | 2021 |
| Předmět: |
Work (thermodynamics)
Materials science Quantitative Biology::Tissues and Organs Flow (psychology) 02 engineering and technology Computational fluid dynamics 01 natural sciences Cylinder (engine) law.invention Physics::Fluid Dynamics symbols.namesake 0203 mechanical engineering Rheology law 0103 physical sciences 010301 acoustics Hopf bifurcation Shear thinning business.industry Applied Mathematics Reynolds number Mechanics 020303 mechanical engineering & transports Modeling and Simulation symbols business |
| Zdroj: | Applied Mathematical Modelling. 89:1640-1662 |
| ISSN: | 0307-904X |
| DOI: | 10.1016/j.apm.2020.08.033 |
| Popis: | In this work, the rheological behavior of power-law fluids on the flow dynamics is studied numerically. Studied cases include confined and non-confined problems that involve a single and two cylinders in tandem for 2-D and 3-D. For 2-D cases, the critical Reynolds numbers that define the Hopf bifurcation and its relation between the blockage ratio and the nature of the fluid are analyzed, including a complete CFD analysis. Results show that the blockage ratio, the addition of a second cylinder, and the rheological properties directly influence the flow’s behavior. In this respect, the critical Reynolds number decreases by decreasing the power-law index and increasing the blockage ratio using shear-thinning fluids, and by increasing the power-law index in unconfined cases of shear-thickening fluids. For the 3-D case, different fluids are compared for a fixed Reynolds number and blockage ratio, proving that pseudoplastic fluids increase mixing capacity. |
| Databáze: | OpenAIRE |
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