On a criterion of incipient motion and entrainment into suspension of a particle from cuttings bed in shear flow of non-Newtonian fluid
| Autor: | Roland May, Oleg Bocharov, Yaroslav Ignatenko |
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| Rok vydání: | 2017 |
| Předmět: |
History
business.industry Laminar flow 02 engineering and technology Mechanics Computational fluid dynamics 01 natural sciences Shields parameter Non-Newtonian fluid 010305 fluids & plasmas Computer Science Applications Education Physics::Fluid Dynamics Lift (force) 020303 mechanical engineering & transports 0203 mechanical engineering Drag 0103 physical sciences Newtonian fluid Geotechnical engineering business Shear flow Geology |
| Zdroj: | Journal of Physics: Conference Series. 894:012037 |
| ISSN: | 1742-6596 1742-6588 |
| DOI: | 10.1088/1742-6596/894/1/012037 |
| Popis: | Solids transport is a major issue in high angle wells. Bed-load forms by sediment while transport and accompanied by intermittent contact with stream-bed by rolling, sliding and bouncing. The study presents the results of a numerical simulation of a laminar steady-state flow around a particle at rest and in free motion in a shear flow of Herschel–Bulkley fluid. The simulation was performed using the OpenFOAM open-source CFD package. A criterion for particle incipient motion and entrainment into suspension from cuttings bed (Shields criteria) based on forces and torques balance is discussed. Deflection of the fluid parameters from the ones of Newtonian fluid leads to decreasing of the drag and lift forces and the hydrodynamic moment. Thus, the critical shear stress (Shields parameter) for the considered non-Newtonian fluid must be greater than the one for a Newtonian fluid. |
| Databáze: | OpenAIRE |
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