A simple phenomenological non-Newtonian fluid model
| Autor: | Martin Zatloukal |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Physics
Applied Mathematics Mechanical Engineering General Chemical Engineering Constitutive equation Mechanics konstituční rovnice Strain rate Condensed Matter Physics generalizovaný Newtonův zákon Non-Newtonian fluid Physics::Fluid Dynamics Condensed Matter::Soft Condensed Matter Shear rate Viscosity Generalized Newtonian fluid Newtonian fluid General Materials Science Extensional viscosity generalized Newtonian law |
| Zdroj: | Journal of Non-Newtonian Fluid Mechanics |
| Popis: | V této práci byl navržen jednoduchý fenomenologický generalizovaný Newtonův model, který byl testován pro různé typy polymerních tavenin. In this work, a simple phenomenological generalized Newtonian law model has been proposed and tested for different polymer melts by using rheological data taken from the open literature. Viscosity is given as a specific function of three principal invariants of the deformation rate tensor, D, and its absolute value defined as root D*D. It has been found that the model predictions are in very good agreement with the strain rate dependent steady shear and uniaxial extensional viscosities for linear and branched polyolefines. The model behaves correctly in description of steady planar and equibiaxial extensional viscosities and allows their independent strain hardening level control with respect to uniaxial extensional viscosity. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|