Oldroyd B, and not A?
We examine Oldroyd’s 1950 paper On the Formulation of Rheological Equations of State (Oldroyd, 1950) in which he introduced the upper and lower convected time-derivatives, along with the Oldroyd-A and Oldroyd-B model fluids. Those developments are placed in context of prior ideas and his own subsequ...
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Veröffentlicht in: | Journal of non-Newtonian fluid mechanics 2021-12, Vol.298, p.104668, Article 104668 |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
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Online-Zugang: | Volltext |
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Zusammenfassung: | We examine Oldroyd’s 1950 paper On the Formulation of Rheological Equations of State (Oldroyd, 1950) in which he introduced the upper and lower convected time-derivatives, along with the Oldroyd-A and Oldroyd-B model fluids. Those developments are placed in context of prior ideas and his own subsequent papers on constitutive equations. The choice between the A and B models is addressed by looking at micro-structural studies, finding that something in between is appropriate. Finally some refinements are discussed in terms of the elastic-dumbbell model.
•Oldroyd’s 1950 paper.•Derivation of upper and lower convected time-derivatives.•Choice between Oldroyd-B and Oldroyd-A.•Insights from micro-structural studies.•Refinements from elastic-dumbbell model. |
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ISSN: | 0377-0257 1873-2631 |
DOI: | 10.1016/j.jnnfm.2021.104668 |