Steady shear banding in complex fluids
| Autor: | Evangelos Voyiatzis, Christos Tsenoglou |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Materials science
Applied Mathematics Mechanical Engineering General Chemical Engineering Rheometer Mechanics Condensed Matter Physics Condensed Matter::Soft Condensed Matter Physics::Fluid Dynamics Shear modulus Shear rate Simple shear Classical mechanics Critical resolved shear stress Shear stress General Materials Science Shear velocity Shear flow |
| Zdroj: | Journal of Non-Newtonian Fluid Mechanics. 151:119-128 |
| ISSN: | 0377-0257 |
| Popis: | Shear banding (SB) is manifested by the abrupt “demixing” of the flow into regions of high and low shear rate. In this paper, we first relate analytically the rheological parameters of the fluid with the range of shear rates and stresses of SB occurrence. For this, we accept that the origin of shear banding is constitutive, and adopt a non-linear viscoelastic expression able to accommodate the double-valuedness of the stress with flow intensity, under certain conditions. We then implement the model for the case of pressure driven flow through a cylindrical pipe; we derive approximate expressions for the velocity profile in the two-banded regions (core and outer annular), the overall throughput in the presence or absence of “spurt”, and the radial location limits of the shear rate discontinuity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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