On the combined effects of slip, compressibility, and inertia on the Newtonian extrudate-swell flow problem
| Autor: | Kountouriotis, Zacharias, Georgiou, Georgios C., Mitsoulis, Evan C. |
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| Přispěvatelé: | Mitsoulis, Evan C. [0000-0001-8781-4784], Georgiou, Georgios C. [0000-0002-7451-224X] |
| Rok vydání: | 2013 |
| Předmět: |
Finite element method
Newtonian fluid General Computer Science Inertia Physics::Instrumentation and Detectors media_common.quotation_subject Excess pressure Extrudate swell Slip (materials science) Die swell Physics::Geophysics Reynolds number Physics::Fluid Dynamics Slip symbols.namesake Incompressible flow Convergence of numerical methods media_common Physics Compressibility Newtonian fluids General Engineering Exit correction Mechanics Excess pressure losses symbols Slip ratio Stability |
| Zdroj: | Computers and Fluids Comput.Fluids |
| Popis: | We solve both the planar and axisymmetric extrudate-swell flows of a compressible Newtonian liquid with Navier slip at the wall, using the finite-element method in space and a fully-implicit finite-difference scheme in time. Our aim is to investigate the combined effects of compressibility, slip, and inertia on the shape of the extrudate and the extra pressure losses in the system (exit correction factor). The numerical simulations show that compressibility at moderate and higher Reynolds numbers results in stable steady-state solutions in which the extrudate surface is wavy, especially just after the die exit. The stability of these oscillatory steady-states is investigated by means of time-dependent calculations. At moderate Reynolds and slip numbers, interesting oscillatory extrudate shapes are observed due to the fact that slip tends to reduce the extrudate contraction opposing the inertia effect. The final extrudate swell ratios obtained at high Reynolds numbers and various slip numbers agree well with the theoretical asymptotic values for the case of incompressible flow. © 2012 Elsevier Ltd. 71 297 305 Cited By :4 |
| Databáze: | OpenAIRE |
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