کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1703211 | 1012368 | 2014 | 10 صفحه PDF | دانلود رایگان |
The Bingham fluid model was developed to represent viscoplastic materials that change from rigid bodies at low stress to viscous fluids at high stress – a process termed yielding. Such a fluid model is used in the modeling of slurries, which occur frequently in food processing and other engineering applications.We consider the flow of a Bingham fluid between infinitely long coaxial cylinders, when the inner cylinder rotates. This is of relevance to a number of applications, including rheometry. We assume a yielded flow, comprising an inner fluid zone and an outer solid zone; and apply a perturbation procedure to analyze the changes in the characteristics of this during a transition from pure annular fluid motion (no axial flow) to a helical fluid motion, where a small axial fluid flow rate is imposed.This analysis gives explicit expressions for the changed fluid velocity field as well as movement in the location of the solid–fluid boundary.
Journal: Applied Mathematical Modelling - Volume 38, Issue 23, 1 December 2014, Pages 5382–5391