Re-Entrant Corner for a White-Metzner Fluid
Autor: | Nicholas A.M. Monk, Stephen Chaffin, William B. Zimmerman, Julia M. Rees |
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Rok vydání: | 2021 |
Předmět: |
Flow (psychology)
02 engineering and technology boundary layer 01 natural sciences Viscoelasticity 010305 fluids & plasmas corner flows Physics::Fluid Dynamics 0103 physical sciences Upstream (networking) viscoelasticity Fluid Flow and Transfer Processes QC120-168.85 Shear thinning Mechanical Engineering Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Condensed Matter::Soft Condensed Matter Boundary layer Descriptive and experimental mechanics Fictitious force Thermodynamics Re entrant QC310.15-319 0210 nano-technology Layer (electronics) Geology |
Zdroj: | Fluids Volume 6 Issue 7 Fluids, Vol 6, Iss 241, p 241 (2021) |
ISSN: | 2311-5521 |
Popis: | Viscoelastic fluids can be difficult to model due to the wide range of different physical behaviors that polymer melts can exhibit. One such feature is the viscous elastic boundary layer. We address the particular problem of a viscoelastic shear-dependent fluid flowing past a corner and investigate how the properties of the boundary layer change for a White-Metzner fluid. The boundary layer equations are derived and the upstream layer is matched with the far-field flow. It was found that if the fluid is sufficiently shear thinning then the viscoelastic boundary layer formulation fails due to the inertial forces becoming dominant. The depth of the boundary layer is controlled by the shear-thinning parameters. These effects are not a feature of other shear-thinning models, such as the Phan-Thien-Tanner model. This study provides insight in the different effects of some commonly used viscoelastic models in corner flows in the upstream boundary layer, the downstream boundary layer is not addressed. |
Databáze: | OpenAIRE |
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