Viscoplastic flow in a pipe of complex cross section with stick–slip at the wallстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 8 апреля 2022 г.
Аннотация:The Poiseuille flow of a Bingham fluid with the yield slip condition at the wall is examined. The governing equations are solved employingthe accelerated augmented Lagrangian method for both the viscoplastic model and the yield slip equation. We solve numerically the flow inpipes with different cross-sections: equilateral and isosceles triangles, L-shape, and hourglass-shape. The combined effects of viscoplasticityand slip on the flow have been investigated. The evolution of the unyielded regions has been studied. The computations cover the full rangeof the two main dimensionless numbers and exhibit complex flow patterns: all the different flow regimes are identified in ducts of variouscross sections.