期刊
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
卷 220, 期 -, 页码 44-56出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jnnfm.2014.08.008
关键词
Thixotropy; Viscoplasticity; Flow past a cylinder; Papanastasiou regularisation
类别
资金
- European Regional Development fund
- Republic of Cyprus through the Research Promotion Foundation [TPiE/PiHPO/0609(BIE)/11]
We study the flow of a thixotropic fluid around a cylinder. The rheology of the fluid is described by means of a structural viscoplastic model based on the Bingham constitutive equation, regularised using the Papanastasiou regularisation. The yield stress is assumed to vary linearly with the structural parameter, which varies from zero (completely broken structure) to one (fully developed skeleton structure), following a first-order rate equation which accounts for material structure break-down and build-up. The results were obtained numerically using the Finite Element Method. Simulations were performed for a moderate Reynolds number of 45, so that flow recirculation is observed behind the cylinder, but vortex shedding does not occur. The effects of the Bingham number and of the thixotropy parameters are studied. The results show that the viscous character of the flow can be controlled within certain limits through these parameters, despite the fact that the Reynolds number is fixed. (C) 2014 Elsevier B.V. All rights reserved.
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