Alternative derivation of differential constitutive equations of the Oldroyd-B type
โ Scribed by P.J. Oliveira
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 555 KB
- Volume
- 160
- Category
- Article
- ISSN
- 0377-0257
No coin nor oath required. For personal study only.
โฆ Synopsis
Now that almost 60 years have passed since the pioneering works of J.G. Oldroyd it seems appropriate as an homage to consider here constitutive equations that can be viewed as generalisations of the by now classical Oldroyd-B model. In this short communication we shall address heuristically the theme of differential constitutive models and will provide an alternative way of deriving a "modified FENE" equation (FENE-M) and inter-relating the PTT and FENE-P-like models.
๐ SIMILAR VOLUMES
The main purpose of this paper is to study oscillatory and stability properties of linear systems of differential equations with piecewise constant argument in which the argument has a fixed point in each interval of a certain length. The results obtained solve a problem proposed by I. Gyori and G.
Reasonable agreement between an OLDnoYn-type theory and experiment for helical flows of viscoelastic fluids was found. However, it was not found possible to predict accurately the experimental drag on a sphere using "constants" found from helical flow tests. It is concluded that the flow curve of th